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 There are 3 words containing OPERIODISM| PHOTOPERIODISM | • photoperiodism n. (Biology) The growth, development and other responses of plants and animals according to the length… • PHOTOPERIODISM n. a plant or animal's response or capacity to respond to photoperiod. |  | PHOTOPERIODISMS | • photoperiodisms n. Plural of photoperiodism. • PHOTOPERIODISM n. a plant or animal's response or capacity to respond to photoperiod. |  | THERMOPERIODISM | • thermoperiodism n. The property of being thermoperiodic. • THERMOPERIODISM n. the effect on an organism of rhythmic temperature variations. |  
 Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America. Definitions are short excerpt from the WikWik.org and 1Word.ws. 
 See this list for:- English Wiktionary: 3 words
 - Scrabble in French: 2 words
 - Scrabble in Spanish: no word
 - Scrabble in Italian: 2 words
 - Scrabble in German: no word
 - Scrabble in Romanian: 2 words
 
 
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