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There are 8 thirteen-letter words beginning with TROP

TROPHALLACTICtrophallactic adj. Relating to trophallaxis.
TROPHALLACTIC adj. relating to trophallaxis, mutual exchange of nutriment in symbiosis.
TROPHOBLASTICtrophoblastic adj. Of, or relating to a trophoblast.
TROPHOBLASTIC adj. of or like a trophoblast.
TROPHOTROPISMtrophotropism n. The movements of the organs in a growing plant, as towards nutrient substances, induced by the chemical…
TROPHOTROPISM n. direction of growth by nutritional factors.
TROPICALISINGtropicalising v. Present participle of tropicalise.
TROPICALISE v. to make tropical, also TROPICALIZE.
TROPICALITIESTROPICALITY n. the state of being tropical.
TROPICALIZINGtropicalizing v. Present participle of tropicalize.
TROPICALIZE v. to make tropical, also TROPICALISE.
TROPOCOLLAGENtropocollagen n. (Biochemistry) A component of fibres of collagen in which three polypeptide chains are coiled around each other.
TROPOCOLLAGEN n. a subunit of collagen fibrils consisting of three polypeptide strands arranged in a helix.
TROPOSCATTERSTROPOSCATTER n. the propagation of radio waves by using irregularities in the troposphere to scatter the signals beamed up by means of high-powered UHF transmitters and parabolic antennas.

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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