thermoperiod

noun
ther·​mo·​period | \¦thərmō+\

Definition of thermoperiod 

: the period of exposure of a plant to a particular temperature specifically : the period characteristic of the diurnal alternation of day and night temperature when both period and temperature are at or near the optimum for the induction of various activities (as growth or flowering) — compare photoperiod

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Other Words from thermoperiod

thermoperiodic \ ¦thər(ˌ)mō+ \ adjective

History and Etymology for thermoperiod

therm- + period

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