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pho·to·pe·ri·od·ism
 photoperiodism
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- pronunciation:
- fo
to
pi
ri
dih
zm
| part of speech: |
noun |
| definition: |
the effect, as on growth or behaviors in plants or animals, caused by variations in the lengths of time they are exposed to light.
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| derivation: |
photoperiodicity (n.) |
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