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List of 12-letter words containing

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There are 19 twelve-letter words containing M, N, 2O and X

AXONOMETRIESAXONOMETRY n. the branch of crystallography concerned with measurement of the axes of crystals.
COMPLEXATIONcomplexation n. (Chemistry) The formation of a complex.
COMPLEXATION n. a complex.
COMPLEXIONALcomplexional adj. (Obsolete) Pertaining to one’s physical composition; constitutional.
complexional adj. (Obsolete) Pertaining to one’s mental disposition; temperamental.
complexional adj. Pertaining to the complexion of the skin.
COMPLEXIONEDcomplexioned adj. (In combination) Having a specified type of complexion.
COMPLEXIONED adj. having a particular complexion.
CYTOTAXONOMYcytotaxonomy n. (Taxonomy) The classification of organisms based upon their cellular structure and function, and especially…
CYTOTAXONOMY n. the classification of organisms based on cell structure, esp. the number, shape, etc., of the chromosomes.
EXCOMMUNIONSEXCOMMUNION n. (Milton) excommunication.
EXPROMISSIONexpromission n. (Law) The intervention of a new debtor, substituted for the former one, who is consequently discharged…
EXPROMISSION n. relieving another person's debt by taking it upon oneself.
HAEMATOXYLONHAEMATOXYLON n. any thorny leguminous tree of the genus Haematoxylon, esp. the logwood, of tropical America and SW Africa, the heartwood of which yields the dye haematoxylin.
HYDROXONIUMShydroxoniums n. Plural of hydroxonium.
HYDROXONIUM n. the obsolete name for the cation H3O+ derived from protonation of water.
IMMUNOTOXINSimmunotoxins n. Plural of immunotoxin.
IMMUNOTOXIN n. a toxin with immunosuppressive effects.
MORPHOSYNTAXmorphosyntax n. (Linguistics) Morphology and syntax regarded as an interlinked unit.
morpho-syntax n. (Linguistics) The system of the internal structure of words (morphology) and the way in which words…
morpho-syntax n. (Linguistics, formal) Grammar.
MOXIBUSTIONSmoxibustions n. Plural of moxibustion.
MOXIBUSTION n. cauterization by use of moxa.
PNEUMOTHORAXpneumothorax n. (Medicine) Presence of air inside the pleural cavity, usually caused by injury either to the lung or the chest wall.
PNEUMOTHORAX n. accumulation of air or gas in the pleural cavity.
PROXIMATIONSproximations n. Plural of proximation.
PROXIMATION n. immediate nearness in time, place, relationship, etc., also PROXIMITY.
SEROTAXONOMYSEROTAXONOMY n. serological analysis as a source of information for taxonomic classification.
THROMBOXANESthromboxanes n. Plural of thromboxane.
THROMBOXANE n. any of several compounds formed from prostaglandin endoperoxides which, when released from blood platelets, induce platelet aggregation and arterial constriction.
TOXICOMANIAStoxicomanias n. Plural of toxicomania.
TOXICOMANIA n. a morbid craving for poisons.
XANTHOMATOUSxanthomatous adj. Of or relating to xanthoma or xanthomatosis.
XANTHOMATOUS adj. of or like a xanthoma, a skin disease marked by the development or irregular yellowish patches upon the skin.
XENODOCHIUMSxenodochiums n. Plural of xenodochium.
XENODOCHIUM n. a building for the reception of strangers, e.g. a guesthouse in a monastery.

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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