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There are 8 twelve-letter words containing C, I, M, P, 2R and U

ARCHESPORIUMarchesporium n. (Botany) Any of the cells of the sporangium that give rise to spores.
ARCHESPORIUM n. a primitive cell or group of cells from which a mother cell develops.
MICROPTEROUSmicropterous adj. (Entomology) Having small, sometimes merely vestigial, wings.
MICROPTEROUS adj. having small wings or fins.
MICROSPOROUSmicrosporous adj. Relating to microspores.
MICROSPOROUS adj. of or like a microspore, also MICROSPORIC.
PERICARDIUMSpericardiums n. Plural of pericardium.
PERICARDIUM n. a membranous sac containing the heart.
PERICRANIUMSpericraniums n. Plural of pericranium.
PERICRANIUM n. a membrane covering the skull.
PERIOSTRACUMperiostracum n. (Malacology) The proteinaceous outer sheath of many molluscan shells.
PERIOSTRACUM n. the horny outer layer of a mollusc's shell.
SCRIPTORIUMSscriptoriums n. Plural of scriptorium.
SCRIPTORIUM n. (Latin) a writing room, esp. of scribes in medieval monastery.
SCRIPTURISMSSCRIPTURISM n. adherence to the scriptures.

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 1Word.ws and WikWik.org.

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