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There are 8 nine-letter words beginning with PERIO

PERIODATEperiodate n. (Inorganic chemistry) Either of two oxyanions of iodine; any salt containing these anions.
PERIODATE n. a salt of periodic acid.
PERIODIDEperiodide 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.
PERIODIDSperiodids n. Plural of periodid.
PERIODID n. a compound of iodine, also PERIODIDE.
PERIODINGperioding v. Present participle of period.
PERIOD v. (Shakespeare) to put an end to.
PERIODISEperiodise v. Alternative form of periodize.
PERIODISE v. to divide into periods, also PERIODIZE.
PERIODIZEperiodize 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.
PERIOSTEAperiostea n. Plural of periosteum.
PERIOSTEUM n. a tough fibrous membrane covering the surface of bones, also PERIOST.
PERIOTICSperiotics n. Plural of periotic.
PERIOTIC n. a bone of the middle ear.

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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