bôn-gelloedd

noun plural
in English is:

stem cells

Use

y bôn-gelloedd hyn
fy môn-gelloedd i
dy fôn-gelloedd di
ei fôn-gelloedd ef/o
ei bôn-gelloedd hi
ein bôn-gelloedd ni
eich bôn-gelloedd chi
eu bôn-gelloedd nhw/hwy
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