in English is:

phototropism

Mutations

Soft:(no mutation)
Nasal:(no mutation)
Aspirate:(no mutation)

Use

y ffototropedd hwn
fy ffototropedd i
dy ffototropedd di
ei ffototropedd ef/o
ei ffototropedd hi
ein ffototropedd ni
eich ffototropedd chi
eu ffototropedd nhw/hwy
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