List of 9-letter words containing

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There are 12 nine-letter words containing PERIO

APERIODIC	• aperiodic adj. That does not recur periodically. • aperiodic adj. (Physics) That does not have a periodic vibration. • aperiodic adj. (Mathematics, stochastic processes, of a state) for which any return to it may occur at irregular times; not periodic.
IMPERIOUS	• imperious adj. Domineering, arrogant, or overbearing. • imperious adj. Urgent. • imperious adj. (Obsolete) Imperial or regal.
PERIODATE	• periodate n. (Inorganic chemistry) Either of two oxyanions of iodine; any salt containing these anions. • PERIODATE n. a salt of periodic acid.
PERIODIDE	• periodide n. (Inorganic chemistry) An iodide containing a higher proportion of iodine than any other iodide of the… • PERIODIDE n. an iodid, a salt of hydriodic acid, also PERIODID.
PERIODIDS	• periodids n. Plural of periodid. • PERIODID n. a compound of iodine, also PERIODIDE.
PERIODING	• perioding v. Present participle of period. • PERIOD v. (Shakespeare) to put an end to.
PERIODISE	• periodise v. Alternative form of periodize. • PERIODISE v. to divide into periods, also PERIODIZE.
PERIODIZE	• periodize v. (Transitive) To divide (history) into periods. • periodize v. (Weightlifting, sports) To split (a training program) into segments of a few weeks or months, so that… • PERIODIZE v. to divide into periods, also PERIODISE.
PERIOSTEA	• periostea n. Plural of periosteum. • PERIOSTEUM n. a tough fibrous membrane covering the surface of bones, also PERIOST.
PERIOTICS	• periotics n. Plural of periotic. • PERIOTIC n. a bone of the middle ear.
SUBPERIOD	• subperiod n. A period making up part of a larger period. • SUBPERIOD n. part of a period.
SUPERIORS	• superiors n. Plural of superior. • SUPERIOR n. one who is superior.

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: 33 words
Scrabble in French: 19 words
Scrabble in Spanish: 14 words
Scrabble in Italian: 32 words
Scrabble in German: 5 words
Scrabble in Romanian: 19 words

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