List of 12-letter words containing ••••••

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There are 15 twelve-letter words containing H, 2I, 3O and S

HISTORIOLOGY	• historiology n. (Obsolete) a discourse on history. • HISTORIOLOGY n. the study of history.
HOMOIOUSIANS	• homoiousians n. Plural of homoiousian. • HOMOIOUSIAN n. one of those, in the 4th century maintained that the Son had a like but not the same essence or substance with the Father.
HOMOLOGISING	• homologising v. Present participle of homologise. • HOMOLOGISE v. to determine the homologies or structural relations of, also HOMOLOGIZE.
IONOPHORESIS	• ionophoresis n. The movement of charged particles in an electric field. • ionophoresis n. Misspelling of iontophoresis. • IONOPHORESIS n. the migration of charged particles, e.g. of a drug, into body tissue.
OOPHORITISES	• OOPHORITIS n. inflammation of the ovaries.
OPHIOLOGISTS	• ophiologists n. Plural of ophiologist. • OPHIOLOGIST n. a student of ophiology.
OPISTHODOMOI	• opisthodomoi n. Plural of opisthodomos. • OPISTHODOMOS n. (Greek) a portico or apartment at the back of an ancient Greek or Roman temple.
OPISTHOTONIC	• opisthotonic adj. Relating to opisthotonus. • OPISTHOTONIC adj. of or like opisthotonos, extreme arching backwards of the spine and neck as a result of spasm of the muscles in that region.
PHOTOFISSION	• photofission n. (Nuclear physics) Nuclear fission as the result of the absorption of a gamma ray or other high-energy photon. • photofission v. (Nuclear physics) To undergo, or cause to undergo, photofission. • PHOTOFISSION n. nuclear fission induced by gamma rays.
PHOTOIONISED	• photoionised adj. Alternative spelling of photoionized. • PHOTOIONISE v. to ionize by electromagnetic radiation, also PHOTOIONIZE.
PHOTOIONISES	• PHOTOIONISE v. to ionize by electromagnetic radiation, also PHOTOIONIZE.
PHOTOIONIZES	• photoionizes v. Third-person singular simple present indicative form of photoionize. • PHOTOIONIZE v. to ionize by electromagnetic radiation, also PHOTOIONISE.
PHOTOOXIDISE	• PHOTOOXIDISE v. to undergo photooxidation, also PHOTOOXIDIZE.
STOICHIOLOGY	• stoichiology n. The part of physiology that deals with the elements, or principles, composing animal tissues. • stoichiology n. (Logic) The doctrine of the elementary requisites of mere thought. • stoichiology n. The statement or discussion of the first principles of any science or art.
TROPHOBIOSIS	• trophobiosis n. (Zoology) A symbiotic association in which one organism obtains or provides food for another. • TROPHOBIOSIS n. exchange of nutriment in symbiotic relationship.

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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English Wiktionary: 43 words
Scrabble in French: 3 words
Scrabble in Spanish: 10 words
Scrabble in Italian: 9 words
Scrabble in German: no word
Scrabble in Romanian: 25 words

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