| 单词 | photoperiodism |
| 释义 | photoperiodism /foh'teuh pear"ee euh diz'euhm/, n. Biol. the response, as affecting growth or reproduction, of an organism to the length of exposure to light in a 24-hour period. Also called photoperiodicity /foh'toh pear'ee euh dis"i tee/. [1915-20; PHOTOPERIOD + -ISM] |
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