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There are 10 twelve-letter words containing H, M, 2O, 2R and U

FLUOROCHROMEfluorochrome n. Any of various fluorescent dyes used to stain biological material before microscopic examination.
FLUOROCHROME n. any of various fluorescent substances used in biological staining to produce fluorescence in a specimen.
HETEROMEROUSheteromerous adj. (Biology) Having different types or numbers of parts (within the same or similar structure).
HETEROMEROUS adj. unequal or different parts within the same structure.
MOUTHBROODERmouthbrooder n. (Zoology) Any animal that cares for its offspring, either eggs or juveniles, by holding them in its…
MOUTHBROODER n. a cichlid fish that carries its young in its mouth for protection, also MOUTHBREEDER.
NEUROHORMONEneurohormone n. Any hormone that stimulates the nervous system.
NEUROHORMONE n. a hormone (as acetylcholine or norepinephrine) produced by or acting on nervous tissue.
NEUROHUMORALneurohumoral adj. (Anatomy) Of, pertaining to, or produced by a neurohumor.
NEUROHUMORAL adj. relating to neurohumor.
NEUROHUMOURSneurohumours n. Plural of neurohumour.
NEUROHUMOUR n. a neurohormone, esp. a neurotransmitter, also NEUROHUMOR.
PARAMORPHOUSparamorphous adj. (Mineralogy) Relating to, or exhibiting, paramorphism.
PARAMORPHOUS adj. of or like a paramorph.
PERIMORPHOUSperimorphous adj. Perimorphic.
PERIMORPHOUS adj. like a perimorph, also PERIMORPHIC.
RADIOTHORIUMradiothorium n. (Physics) The radioactive isotope thorium-228.
RADIOTHORIUM n. a radioactive isotope of thorium with the mass number 228.
XEROMORPHOUSxeromorphous adj. Xeromorphic.
XEROMORPHOUS adj. of parts of a plant, protected against excessive loss of water by thick cuticles, coatings of hairs and similar structural features, also XEROMORPHIC.

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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