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There are 10 twelve-letter words containing ROTROP

AEROTROPISMS	• AEROTROPISM n. curvature in response to concentration of oxygen.
HETEROTROPHS	• heterotrophs n. Plural of heterotroph. • HETEROTROPH n. a secondary feeder eating plants or other animals.
HETEROTROPHY	• heterotrophy n. The state of being a heterotroph. • HETEROTROPHY n. the state of being a heterotroph, a secondary feeder eating plants or other animals.
HYDROTROPISM	• hydrotropism n. (Biology) The movement of a plant (or other organism) in response to water, either towards or away from water. • HYDROTROPISM n. growth in the direction of water.
NECROTROPHIC	• necrotrophic adj. (Biology) Describing a parasite that kills its host, then feeds on the dead matter. • NECROTROPHIC adj. of or like a necrotroph, a parasitic organism that kills the living cells of its host and then feeds on the dead material.
NEUROTROPHIC	• neurotrophic adj. Of or relating to neurotrophy. • NEUROTROPHIC adj. relating to the nutrition of the nervous system, or to nutritional changes influenced by the nervous system.
SAPROTROPHIC	• saprotrophic adj. Of or pertaining to saprotrophs (or saprobes). • SAPROTROPHIC adj. of or like a saprotroph.
THYROTROPHIC	• thyrotrophic adj. That stimulates the thyroid gland. • thyrotrophic adj. Of or pertaining to thyrotropism. • THYROTROPHIC adj. exerting or characterized by a direct influence on the secretory activity of the thyroid gland, also THYROTROPIC.
THYROTROPHIN	• thyrotrophin n. Alternative form of thyrotropin. • THYROTROPHIN n. a hormone, produced in the anterior lobe of the pituitary gland, which stimulates the thyroid, also THYROTROPIN.
THYROTROPINS	• thyrotropins n. Plural of thyrotropin. • THYROTROPIN n. a hormone, produced in the anterior lobe of the pituitary gland, which stimulates the thyroid, also THYROTROPHIN.

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: 37 words
Scrabble in French: 3 words
Scrabble in Spanish: no word
Scrabble in Italian: 4 words
Scrabble in German: no word
Scrabble in Romanian: 3 words

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