in English is:

speed

Mutations

Soft:gyflymedd
Nasal:nghyflymedd
Aspirate:chyflymedd

Use

y cyflymedd hwn
fy nghyflymedd i
dy gyflymedd di
ei gyflymedd ef/o
ei chyflymedd hi
ein cyflymedd ni
eich cyflymedd chi
eu cyflymedd nhw/hwy
Phrases (1)
cyflymedd y galon
medicine
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