| 单词 | photoperiod |
| 释义 | photoperiod —photoperiodic /foh'teuh pear'ee od"ik/, photoperiodical, adj. —photoperiodically, adv. /foh'teuh pear"ee euhd/, n. Biol. the interval in a 24-hour period during which a plant or animal is exposed to light. [1915-20; PHOTO- + PERIOD] |
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