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There are 9 eleven-letter words beginning with PHOTOP

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.
PHOTOPHASES	• photophases n. Plural of photophase. • PHOTOPHASE n. the light period of a photoperiodic cycle of light and dark.
PHOTOPHILIC	• photophilic adj. (Biology) That thrives in bright sunlight. • PHOTOPHILIC adj. light-loving, turning towards the light, also PHOTOPHILOUS.
PHOTOPHOBES	• PHOTOPHOBE n. a plant that shuns or avoids light.
PHOTOPHOBIA	• photophobia n. (Medicine) Excessive sensitivity to light and the aversion to bright light; abnormal fear of light. • photophobia n. An aversion to or fear of being photographed, the dissemination of personal photographs, or viewing photographs. • PHOTOPHOBIA n. the morbid fear of light.
PHOTOPHOBIC	• photophobic adj. (Biology) That thrives at a relatively low light level. • photophobic adj. Of, relating to, or exhibiting photophobia. • PHOTOPHOBIC adj. having a fear of the light.
PHOTOPHONES	• photophones n. Plural of photophone. • PHOTOPHONE n. an apparatus for the production of sound by the action of rays of light.
PHOTOPHONIC	• photophonic adj. Of or pertaining to the photophone. • PHOTOPHONIC adj. relating to photophony.
PHOTOPHORES	• photophores n. Plural of photophore. • PHOTOPHORE n. a luminiferous organ.

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: 23 words
Scrabble in French: 2 words
Scrabble in Spanish: no word
Scrabble in Italian: no word
Scrabble in German: no word
Scrabble in Romanian: no word

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