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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

COMMENSALISM• commensalism 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.
COMMITTEEMAN• committeeman 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.
COMMUNALISMS• communalisms n. Plural of communalism.
• COMMUNALISM n. social organization on a communal basis.
CUPRAMMONIUM• cuprammonium n. (Inorganic chemistry) Synonym of cuproammonium.
• CUPRAMMONIUM n. a solution of cupric hydroxide in ammonia.
IMMEMORIALLY• immemorially adv. In an immemorial manner, from time immemorial.
• IMMEMORIAL adv. extending or existing since beyond the reach of memory, record, or tradition.
MAMMALOGICAL• mammalogical adj. Of, or pertaining to, mammalogy.
• MAMMALOGICAL adj. related to mammalogy.
MAMMALOGISTS• mammalogists n. Plural of mammalogist.
• MAMMALOGIST n. a student of mammals.
MAMMECTOMIES• mammectomies n. Plural of mammectomy.
• MAMMECTOMY n. the surgical removal of a nipple.
MAMMILLATION• mammillation n. A protuberance in the form of a nipple.
• MAMMILLATION n. a nipple-like protrusion, also MAMILLATION.
MAMMILLIFORM• mammilliform adj. Having the form of a mammilla.
• MAMMILLIFORM adj. in the form of a nipple, also MAMILLIFORM.
MAMMOGRAPHIC• mammographic adj. Of, or pertaining to, mammography.
• mammographic adj. Produced using a mammograph.
• MAMMOGRAPHIC adj. relating to mammography.
METAMORPHISM• metamorphism 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.
METASOMATISM• metasomatism 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.
MISSUMMATION• missummation n. Wrong summation; incorrect addition.
• MISSUMMATION n. wrong addition.
MONOGRAMMING• monogramming v. Present participle of monogram.
• MONOGRAM v. to mark with one's initials.
MYCODOMATIUM• MYCODOMATIUM n. a fungus gall.
NONMAMMALIAN• nonmammalian adj. Not mammalian.
SOMNAMBULISM• somnambulism 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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