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There are 12 words beginning with PHOTOTR

PHOTOTRANSISTOR	• phototransistor n. (Electronics) Any semiconductor device whose electrical characteristics are light-sensitive. • PHOTOTRANSISTOR n. a junction transistor, whose base signal is generated by illumination of the base.
PHOTOTROPE	• PHOTOTROPE n. a substance exhibiting phototropism, movement directed by light.
PHOTOTROPES	• PHOTOTROPE n. a substance exhibiting phototropism, movement directed by light.
PHOTOTROPH	• phototroph n. A photoautotroph. • PHOTOTROPH n. a plant which uses light to generate energy needed to absorb nutrients.
PHOTOTROPHIC	• phototrophic adj. (Biology) That exhibits phototrophy. • PHOTOTROPHIC adj. relating to phototropism, movement directed by light.
PHOTOTROPHS	• phototrophs n. Plural of phototroph. • PHOTOTROPH n. a plant which uses light to generate energy needed to absorb nutrients.
PHOTOTROPIC	• phototropic adj. Having a tendency to move in response to light. An animal or microbe that is positively phototropic… • PHOTOTROPIC adj. relating to phototropism, movement directed by light.
PHOTOTROPICALLY	• phototropically adv. In a phototropic manner. • PHOTOTROPIC adv. relating to phototropism, movement directed by light.
PHOTOTROPIES	• PHOTOTROPY n. change of colour due to wavelength of incident light.
PHOTOTROPISM	• phototropism n. (Biology) The movement of a plant towards or away from light. • PHOTOTROPISM n. movement directed by light.
PHOTOTROPISMS	• phototropisms n. Plural of phototropism. • PHOTOTROPISM n. movement directed by light.
PHOTOTROPY	• phototropy n. Phototropism. • PHOTOTROPY n. change of colour due to wavelength of incident light.

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 1Word.ws and WikWik.org.

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English Wiktionary: 48 words
Scrabble in French: 6 words
Scrabble in Spanish: no word
Scrabble in Italian: no word
Scrabble in German: 1 word
Scrabble in Romanian: no word

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