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There are 18 twelve-letter words containing M, 2O, 2P, R and T

AMPHITROPOUSamphitropous adj. (Botany) Having the ovule bent so that the ends are near each other.
AMPHITROPOUS adj. of an ovule, with its point of attachment in the middle.
APOTROPAISMSAPOTROPAISM n. a magical practice averting evil.
HAPTOTROPISMhaptotropism n. (Biology) The movement of parts of a plant (especially tendrils) in response to a touch stimulus.
HAPTOTROPISM n. curving in response to touch, as a tendril.
IMPROPRIATORimpropriator n. (Archaic) A layperson in possession of ecclesiastical property.
IMPROPRIATOR n. a layman who is in possession of a benefice or its revenues.
MORPHOTROPICmorphotropic adj. (Crystallography) Of or pertaining to morphotropism.
morphotropic adj. Describing a phase transition due to a change in composition.
morphotropic adj. Describing the phase boundary between tetragonal and rhombohedral regions of a ferroelectric.
OPPORTUNISMSopportunisms n. Plural of opportunism.
OPPORTUNISM n. the practice of regulating actions by favourable opportunities rather than consistent principles.
PHOTOPOLYMERphotopolymer n. (Chemistry) Any polymer that reacts to light with a physical or chemical change, used especially for teeth fillings.
PHOTOPOLYMER n. a photosensitive plastic used esp. in the manufacture of printing plates.
PHOTOTROPISMphototropism n. (Biology) The movement of a plant towards or away from light.
PHOTOTROPISM n. movement directed by light.
PITTOSPORUMSpittosporums n. Plural of pittosporum.
PITTOSPORUM n. any of numerous chiefly subtropical evergreen shrubs or small trees.
PITYROSPORUMPityrosporum prop.n. Former name of Malassezia (“fungus genus”).
PITYROSPORUM n. a yeastlike fungus which can cause pityriasis.
PLEIOTROPISMpleiotropism n. (Genetics) pleiotropy.
PLEIOTROPISM n. the state of being pleiotropic, having an effect simultaneously on more than one character in the offspring.
PROTOMORPHICprotomorphic adj. (Biology) Having the most primitive character; in the earliest form.
PROTOMORPHIC adj. primordial; primitive.
PROTOPHLOEMSprotophloems n. Plural of protophloem.
PROTOPHLOEM n. the first-formed phloem that develops from procambium, usually associated with a region of rapid growth.
PROTOPLASMALprotoplasmal adj. (Cytology) Of or relating to protoplasm.
PROTOPLASMAL adj. of or like protoplasm, also PROTOPLASMATIC, PROTOPLASMIC, PROTOPLASTIC.
PROTOPLASMICprotoplasmic adj. (Cytology) Of or relating to protoplasm.
PROTOPLASMIC adj. of or like protoplasm, also PROTOPLASMAL, PROTOPLASMATIC, PROTOPLASTIC.
PYROMORPHITEpyromorphite n. (Mineralogy) A yellowish-green mineral, a mixed phosphate and chloride of lead with the chemical formula…
PYROMORPHITE n. a green, brown, or yellow lead ore.
PYTHONOMORPHpythonomorph n. Any large extinct reptile of the taxon Pythonomorpha.
pythonomorph n. Any member of the taxon Pythonomorpha.
PYTHONOMORPH n. a large marine reptile of the Cretaceous period, with long, scaly body and paddle-shaped limbs.
TROPHOPLASMStrophoplasms n. Plural of trophoplasm.
TROPHOPLASM n. the nutritive substance of cell.

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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