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There are 5 words containing OPERIODI

PHOTOPERIODIC	• photoperiodic adj. Of, pertaining to, or exhibiting photoperiodism. • PHOTOPERIODIC adj. relating to a photoperiod.
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.
THERMOPERIODIC	• thermoperiodic adj. Relating to a thermoperiod. • THERMOPERIODIC adj. relating to thermoperiodism, the effect on an organism of rhythmic temperature variations.
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.

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English Wiktionary: 20 words
Scrabble in French: 4 words
Scrabble in Spanish: no word
Scrabble in Italian: 3 words
Scrabble in German: no word
Scrabble in Romanian: 2 words

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