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There are 17 twelve-letter words containing 3O, 2R and 2T

ELECTROMOTORelectromotor n. (Physics) Any device that generates electricity.
electromotor n. (Physics) Any device that converts electricity into motion.
ELECTROMOTOR n. a device for applying electricity as a motive power.
LEVOROTATORYlevorotatory adj. (Chemistry, of an optically active compound or crystal) That rotates the plane of polarized light to…
LEVOROTATORY adj. counterclockwise; rotating the plane of polarization of light to the left, also LAEVOROTATORY, LEVOROTARY.
MOTORBOATERSmotorboaters n. Plural of motorboater.
MOTORBOATER n. one who drives a motorboat.
OROROTUNDITYOROROTUNDITY n. the orotund mode of intonation, also OROTUNDITY.
ORTHOBORATESorthoborates n. Plural of orthoborate.
ORTHOBORATE n. a salt of orthoboric acid.
ORTHOPTEROIDorthopteroid n. (Entomology) Any of the insects historically included in the order Orthoptera, including the cockroaches…
ORTHOPTEROID n. a member of the Orthoptera, cockroaches.
ORTHOPTEROUSorthopterous adj. (Zoology) Belonging to the Orthoptera.
ORTHOPTEROUS adj. pertaining or belonging to insect order including grasshoppers, crickets, etc.
ORTHOTROPIESORTHOTROPY n. the state of being orthotropic, growing along a vertical axis.
ORTHOTROPISMorthotropism n. The property of being orthotropic or orthotropous.
ORTHOTROPISM n. vertical growth.
ORTHOTROPOUSorthotropous adj. (Botany, of an ovule) Growing straight and having the micropyle at the apex.
ORTHOTROPOUS adj. growing straight, so that the micropyle is opposite the stalk.
PROTHONOTARYprothonotary n. (Obsolete, historical) A chief legal clerk or notary in Roman Byzantium, and (hence) in Rome.
prothonotary n. (Roman Catholicism) One of the seven prelates, constituting a college in the Roman Curia, whose office…
prothonotary n. A registrar or chief clerk in various courts of law, especially (US) in a county court, (Australia)…
PROTOHISTORYprotohistory n. The period between prehistory and history, during which a culture or civilization has not yet developed…
PROTOHISTORY n. the study of human beings in the times that immediately antedate recorded history.
PROTOTROPHICprototrophic adj. (Biology) Of or pertaining to a prototroph or to prototrophy.
PROTOTROPHIC adj. of bacteria, feeding directly on uncombined elements.
THERMOMOTORSTHERMOMOTOR n. an engine that produces force from the expansion of a heated fluid.
THOROUGHWORTthoroughwort n. Any of several plants of the genus Eupatorium.
thoroughwort n. The common boneset (Eupatorium perfoliatum).
THOROUGHWORT n. a wild flower with perfoliate leaves.
TRAITORHOODSTRAITORHOOD n. the state of being a traitor.
TROPHOTROPICtrophotropic adj. Relating to trophotropy.
TROPHOTROPIC adj. related to trophotropism, direction of growth by nutritional factors.

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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