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List of 12-letter words containing

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There are 18 twelve-letter words containing A, I, 3M and O

COMMENSALISMcommensalism n. (Ecology) A sharing of the same environment by two organisms where one species benefits and the other…
commensalism n. The act of eating together; table fellowship.
COMMENSALISM n. a relation between two kinds of organisms in which one obtains food or other benefits from the other without damaging or benefiting it.
COMMITTEEMANcommitteeman n. A man who is a member of a committee.
committeeman n. (US) A man who is a local leader of a political party.
COMMITTEEMAN n. a member of a committee.
COMMUNALISMScommunalisms n. Plural of communalism.
COMMUNALISM n. social organization on a communal basis.
CUPRAMMONIUMcuprammonium n. (Inorganic chemistry) Synonym of cuproammonium.
CUPRAMMONIUM n. a solution of cupric hydroxide in ammonia.
IMMEMORIALLYimmemorially adv. In an immemorial manner, from time immemorial.
IMMEMORIAL adv. extending or existing since beyond the reach of memory, record, or tradition.
MAMMALOGICALmammalogical adj. Of, or pertaining to, mammalogy.
MAMMALOGICAL adj. related to mammalogy.
MAMMALOGISTSmammalogists n. Plural of mammalogist.
MAMMALOGIST n. a student of mammals.
MAMMECTOMIESmammectomies n. Plural of mammectomy.
MAMMECTOMY n. the surgical removal of a nipple.
MAMMILLATIONmammillation n. A protuberance in the form of a nipple.
MAMMILLATION n. a nipple-like protrusion, also MAMILLATION.
MAMMILLIFORMmammilliform adj. Having the form of a mammilla.
MAMMILLIFORM adj. in the form of a nipple, also MAMILLIFORM.
MAMMOGRAPHICmammographic adj. Of, or pertaining to, mammography.
mammographic adj. Produced using a mammograph.
MAMMOGRAPHIC adj. relating to mammography.
METAMORPHISMmetamorphism n. (Geology) The process by which rocks are changed into other forms by the application of heat and/or pressure.
metamorphism n. (Zoology) The process by which insects develop through life stages, for example, those of embryo, larva…
metamorphism n. (By extension) Any dramatic change from one thing to another.
METASOMATISMmetasomatism n. (Geology) The process by which the bulk chemical composition of a rock is changed by the introduction…
METASOMATISM n. metamorphism caused chiefly by introduction of fluids and/or ions.
MISSUMMATIONmissummation n. Wrong summation; incorrect addition.
MISSUMMATION n. wrong addition.
MONOGRAMMINGmonogramming v. Present participle of monogram.
MONOGRAM v. to mark with one's initials.
MYCODOMATIUMMYCODOMATIUM n. a fungus gall.
NONMAMMALIANnonmammalian adj. Not mammalian.
SOMNAMBULISMsomnambulism n. Sleepwalking.
SOMNAMBULISM n. an abnormal condition of sleep in which motor acts, such as walking, are performed.

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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