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List of 12-letter words containing

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There are 14 twelve-letter words containing I, 4O and P

NONPOISONOUSnonpoisonous adj. Not poisonous.
non-poisonous adj. Alternative spelling of nonpoisonous.
NONPOISONOUS adj. not poisonous.
ODONTOPHOBIAodontophobia n. An irrational fear of dentistry.
ODONTOPHOBIA n. the fear of teeth.
ONOMATOPOEIAonomatopoeia n. (Uncountable) The property of a word of sounding like what it represents.
onomatopoeia n. (Countable) A word that sounds like what it represents, such as "gurgle," "stutter," or "hiss".
onomatopoeia n. (Uncountable, rhetoric) The use of language whose sound imitates that which it names.
ONOMATOPOEIConomatopoeic adj. Of or relating to onomatopoeia.
onomatopoeic adj. Having the property of onomatopoeia.
onomatopœic adj. Alternative spelling of onomatopoeic.
OPISTHODOMOIopisthodomoi n. Plural of opisthodomos.
OPISTHODOMOS n. (Greek) a portico or apartment at the back of an ancient Greek or Roman temple.
OPISTHODOMOSopisthodomos n. (Greek architecture) A porch at the rear of a temple, set against the blank back wall of the cella.
OPISTHODOMOS n. (Greek) a portico or apartment at the back of an ancient Greek or Roman temple.
OPISTHOTONOSopisthotonos n. (Medicine) Sustained tetanic spasm in which the body is bent backwards and stiffened, as produced by various diseases.
OPISTHOTONOS n. extreme arching backwards of the spine and neck as a result of spasm of the muscles in that region, etc.
OSTEOPOROSISosteoporosis n. (Pathology) A disease, occurring especially in women following menopause, in which the bones become…
OSTEOPOROSIS n. development of a porous structure in bone due to loss of calcium, resulting in brittleness.
OSTEOPOROTICosteoporotic adj. Relating to osteoporosis.
OSTEOPOROTIC adj. relating to osteoporosis.
PHOTOBIOLOGYphotobiology n. The study of the effects of light on living organisms, and on biological processes.
PHOTOBIOLOGY n. the study of the effects of light on organisms.
PODOCONIOSESPODOCONIOSIS n. endemic elephantiasis of the lower legs.
PODOCONIOSISpodoconiosis n. (Pathology) An endemic form of nonfilarial elephantiasis.
PODOCONIOSIS n. endemic elephantiasis of the lower legs.
POGONOTOMIESPOGONOTOMY n. shaving.
PROSOPOPOEIAprosopopoeia n. (Rhetoric) An act of personifying a person or object when communicating to an audience; a figure of…
prosopopoeia n. Personification of an abstraction.
prosopopœia n. Obsolete typography of prosopopoeia.

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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