Y gwahaniaeth rhwng diwygiadau o "Treiglad"

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=== Treigladau trwynol yn yr ieithoedd Celtaidd ===
Mae'r tabl yn dangos gweithrediadau treigladau trwynol yn yr ieithoedd Celtaidd. Oherwydd bod gan bob iaith orgraff ei hun, mae'r treigladau wedi eu trefnu yn ôl eu seiniau. Mae hyn yn ei gwneud yn haws cymharu yr ieithoedd. Er enghraifft, mae '''çh''' Manaweg yn gyfartal â '''t''' (''fain'') yn yr ieithoedd Gaelaidd eraill. Mae'r gell lwyd yn dangos bod dim treiglad meddal yn yr iaith honno am y llythyren honno.
 
:{| class="wikitable" cellspacing="7" style="text-align: center;"
|+'''Treigladau llaes yn yr ieithoedd Celtaidd '''
|-
!  
! style="background-color:#FFE4C4;" width = "100" | [[Llydaweg]]
|-
| rowspan="2" | '''p''' fain
| rowspan="2" | '''p''' fain || {{IPA|/pʲ/}} || style="background-color:#D3D3D3;" |rowspan=4 || stylecolspan="background-color:#D3D3D3;"2| || {{IPA|/pʲ/}} → {{IPA|/bʲ/}} || style="background-color:#D3D3D3;"| rowspan=4 || stylecolspan="background-color:#D3D3D3;"3| || style="background-color:#D3D3D3;" |
| ''Sillafiad''
| '''p''' → '''bp''
|-
| rowspan="2" | '''p''' lydan || {{IPA|/pˠ/}}|| {{IPA|/pˠ/}} → {{IPA|/bˠ/}}
| ''Sillafiad'' || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || '''p''' → '''bp'''|| style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"|
|-
| ''Sillafiad'' || '''p''' → '''bp'''
| rowspan="2" | '''p''' lydan || {{IPA|/pˠ/}} || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || {{IPA|/pˠ/}} → {{IPA|/bˠ/}} || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"|
|-
| rowspan="2" | ''Sillafiad'p''' || style="background-color:#D3D3D3;"{{IPA|/p/}} || {{IPA|/p/}} → {{IPA|/b/}} || style="background-color:#D3D3D3;" colspan=2 rowspan=2| || '''{{IPA|/p'''/}}'''bp'''|| style="background-color:#D3D3D3;"{{IPA|/m̥/}} || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"|
|-
| rowspan="2"''Sillafiad'' || '''p''' || {{IPA|/p/}} || {{IPA|/p/}}{{IPA|/'''b/}} '''|| style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || {{IPA|/'''p/}}'''{{IPA|/m̥/}} '''mh'''|| style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"|
|-
| ''Sillafiad'' || '''p''' → '''b'''|| style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || '''p''' → '''mh'''|| style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"|
|-
| rowspan="2" | '''t''' fain || {{IPA|/tʲ/}} || {{IPA|/ʧ/}} → {{IPA|/j/}} || style="background-color:#D3D3D3;"| || {{IPA|/tʲ/}} → {{IPA|/dʲ/}} || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"|
| ''Sillafiad'' || '''çh''' → '''j''' || style="background-color:#D3D3D3;"| || '''t''' → '''dt'''|| style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"|
|-
| rowspan="2" | '''t''' lydan || {{IPA|/tˠ/}} || {{IPA|/tˠ/}} → {{IPA|/dˠ/}} || style="background-color:#D3D3D3;"| || {{IPA|/tˠ/}} → {{IPA|/dˠ/}} || style="background-color:#D3D3D3;"| ||colspan=3 stylerowspan="background-color:#D3D3D3;"2| || style="background-color:#D3D3D3;"|
|-
| ''Sillafiad'' || '''t''', '''th''' → '''d''' || style="background-color:#D3D3D3;"| || '''t''' → '''dt''' || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"|
|-
| rowspan="2"''Sillafiad'' || '''t''', ||'''th''' {{IPA|/t/}} || style="background-color:#D3D3D3;"|'''d''' || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || {{IPA|/'''t/}}'''{{IPA|/n̥/}}'''dt''' || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"|
|-
| rowspan="2" | ''Sillafiad't''' || style="background-color:#D3D3D3;"{{IPA|/t/}} || style="background-color:#D3D3D3;"| ||colspan=3 stylerowspan="background-color:#D3D3D3;"2| || '''{{IPA|/t'''/}}'''nh'''{{IPA|/n̥/}} || style="background-color:#D3D3D3;"| ||colspan=2 stylerowspan="background-color:#D3D3D3;"|2
|-
| ''Sillafiad'' || '''t''' → '''nh'''
| rowspan="2" | '''ch'''<br>'''çh''' || {{IPA|/ʧ/}} || rowspan = "2" style="background-color:#D3D3D3;"| ''edrychwch ar <br> '''t fain''' || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"|
|-
| rowspan="2" | ''Sillafiad'ch'''<br>'''çh''' || {{IPA|/ʧ/}} || rowspan = "2" style="background-color:#D3D3D3;"| ''edrychwch ar <br> '''t fain''' || style="background-color:#D3D3D3;" colspan=5 rowspan=2| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"|
|-
| ''Sillafiad''
| rowspan="2" | '''c''' fain <br> '''k''' fain || {{IPA|/c/}} || {{IPA|/c/}} → {{IPA|/ɟ/}} || style="background-color:#D3D3D3;"| || {{IPA|/c/}} → {{IPA|/ɟ/}} || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"|
|-
| ''Sillafiad''rowspan="2" || '''c''', fain <br> '''k''' → '''g'''fain || style="background-color:#D3D3D3;"{{IPA|/c/}} || '''{{IPA|/c'''/}}'''gc'''{{IPA|/ɟ/}} || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"{{IPA|/c/}} → {{IPA|/ɟ/}} || style="background-color:#D3D3D3;" colspan=3 rowspan=4| |-
| ''Sillafiad'' || '''pc''', '''k''' → '''bg'''|| style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || '''pc''' → '''mhgc'''|| style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"|
|-
| rowspan="2" | '''c''' lydan <br> '''k''' lydan || {{IPA|/k/}} || {{IPA|/k/}} → {{IPA|/ŋ̊/}} || style="background-color:#D3D3D3;"| || {{IPA|/k/}} → {{IPA|/g/}} || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"|
|-
| ''Sillafiad'' || '''c''', '''k''' → '''g''' || style="background-color:#D3D3D3;"| || '''c''' → '''gc''' || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"|
|-
| rowspan="2" | '''c''' || {{IPA|/k/}} || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || {{IPA|/k/}} → {{IPA|/ŋ̊/}} || style="background-color:#D3D3D3;" colspan=2 rowspan=2| || style="background-color:#D3D3D3;"|
|-
| ''Sillafiad'' || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || '''c''' → '''ngh''' || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"|
|-
| rowspan="2" | '''b''' fain || {{IPA|/bʲ/}} || {{IPA|/b/}} → {{IPA|/m/}} || style="background-color:#D3D3D3;" rowspan=2| || {{IPA|/bʲ/}} → {{IPA|/mʲ/}} || style="background-color:#D3D3D3;"| || stylecolspan="background-color:#D3D3D3;"|3 || stylerowspan="background-color:#D3D3D3;"4|
|-
| ''Sillafiad'' || '''b''' → '''m''' || style="background-color:#D3D3D3;"| || '''b''' → '''mb'''|| style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"|
|-
| rowspan="2" | '''b''' lydan || {{IPA|/bˠ/}} || {{IPA|/b/}} → {{IPA|/m/}} || style="background-color:#D3D3D3;"| || {{IPA|/bˠ/}} → {{IPA|/mˠ/}} || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"|
|-
| ''Sillafiad''
| ''Sillafiad'' || '''b''' → '''m''' || style="background-color:#D3D3D3;"| || '''b''' → '''mb''' || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"|
| '''b''' → '''m'''
| style="background-color:#D3D3D3;"|
| '''b''' → '''mb'''
|-
| rowspan="2" | '''b'''
| rowspan="2" | '''b''' || {{IPA|/b/}} || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || {{IPA|/b/}} → {{IPA|/m/}} || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"|
| {{IPA|/b/}}
| style="background-color:#D3D3D3;" colspan=3 rowspan=2|
| {{IPA|/b/}} → {{IPA|/m/}}
|-
| ''Sillafiad'' || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || '''b''' → '''m'''|| style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"|
| ''Sillafiad'' || '''j''' → '''ny''' || style="background-color:#D3D3D3;"| || '''d''' → '''nd'''|| style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"|
|-
| rowspan="2" | '''d''' lydan || {{IPA|/dˠ/}} || {{IPA|/dˠ/}} → {{IPA|/nˠ/}}, {{IPA|/d/}} || style="background-color:#D3D3D3;"| || {{IPA|/d̪ˠ/}} → {{IPA|/n̪ˠ/}} || style="background-color:#D3D3D3;"| ||colspan=3 stylerowspan="background-color:#D3D3D3;"2| || style="background-color:#D3D3D3;"|
|-
| ''Sillafiad'' || '''d''' → '''n''' || style="background-color:#D3D3D3;"| || '''d''' → '''nd''' || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"|
|-
| rowspan="2" | '''d''' || {{IPA|/d/}} || style="background-color:#D3D3D3;"| || stylecolspan="background-color:#D3D3D3;"|3 || stylerowspan="background-color:#D3D3D3;"2| || {{IPA|/d/}} → {{IPA|/n/}} || style="background-color:#D3D3D3;"| ||colspan=2 stylerowspan="background-color:#D3D3D3;"2|
|-
| ''Sillafiad'' || '''d''' → '''n'''
| ''Sillafiad'' || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || '''d''' → '''n'''|| style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"|
|-
| rowspan="2" | '''j''' || {{IPA|/ʤ/}} || rowspan = "2" style="background-color:#D3D3D3;"| ''edrychwch ar <br> '''d fain''' || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"|
| ''Sillafiad'' || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || '''g''' → '''ng''' || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"|
|-
| rowspan="2" | '''f''' fain || {{IPA|/fʲ/}} || {{IPA|/f/}} → {{IPA|/v/}} || style="background-color:#D3D3D3;"| || {{IPA|/fʲ/}} → {{IPA|/vʲ/}} || style="background-color:#D3D3D3;"| || stylecolspan="background-color:#D3D3D3;"| ||3 stylerowspan="background-color:#D3D3D3;"4|
|-
| ''Sillafiad'' || '''f''' → '''v''' || style="background-color:#D3D3D3;" rowspan=2| || '''f''' → '''bhf''' || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"|
|-
| rowspan="2" | '''f''' lydan || {{IPA|/fˠ/}} || {{IPA|/fw/}} → {{IPA|/hw/}}, {{IPA|/w/}} || style="background-color:#D3D3D3;"| || {{IPA|/fʲˠ/}} → {{IPA|/w/}} || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"|
|-
| ''Sillafiad'' || '''fw''' → '''w''' || style="background-color:#D3D3D3;"| || '''f''' → '''bhf''' || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"| || style="background-color:#D3D3D3;"|
|}
 
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