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There are 11 twelve-letter words containing ROTRO

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.
SYNCHROTRONS• synchrotrons n. Plural of synchrotron.
• SYNCHROTRON n. a type of very high-energy particle accelerator.
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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