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List of 12-letter words containing

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There are 5 twelve-letter words containing B, I, M, N, P, R and T

IMPENETRABLEimpenetrable adj. Not penetrable.
impenetrable adj. (Figuratively) Incomprehensible; fathomless; inscrutable.
impenetrable adj. Opaque; obscure; not translucent or transparent.
IMPENETRABLYimpenetrably adv. In an impenetrable manner or state; imperviously.
IMPENETRABLE adv. incapable of being penetrated or pierced.
IMPROBATIONSimprobations n. Plural of improbation.
IMPROBATION n. in Scots law, an action for the purpose of declaring some instrument false or forged.
PARASYMBIONTparasymbiont n. (Biology) A parasymbiotic symbiont.
PARASYMBIONT n. a partner in parasymbiosis.
PROTHROMBINSprothrombins n. Plural of prothrombin.
PROTHROMBIN n. a protein-like substance present in blood plasma.

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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