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There are 5 words containing OTOPER

PHOTOPERIOD	• photoperiod n. (Biology) The normal duration of natural daylight experienced by an organism; daylength. • PHOTOPERIOD n. the period during every 24 hours when an organism is exposed to daylight.
PHOTOPERIODS	• photoperiods n. Plural of photoperiod. • PHOTOPERIOD n. the period during every 24 hours when an organism is exposed to daylight.
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.
PHOTOPERIODISMS	• photoperiodisms n. Plural of photoperiodism. • PHOTOPERIODISM n. a plant or animal's response or capacity to respond to photoperiod.

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: 28 words
Scrabble in French: 6 words
Scrabble in Spanish: 2 words
Scrabble in Italian: 4 words
Scrabble in German: no word
Scrabble in Romanian: 2 words

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