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There are 5 twelve-letter words containing IOA

BIOACOUSTICS	• bioacoustics n. A cross-disciplinary science that combines biology and acoustics, investigating for instance the mechanisms… • BIOACOUSTICS n. a branch of science concerned with the production of sound by and its effects on living organisms.
BIOAERATIONS	• BIOAERATION n. the oxidative treatment of raw sewage by aeration.
BIOASTRONOMY	• bioastronomy n. Synonym of astrobiology. • BIOASTRONOMY n. the branch of biology which deals with the study or the discovery of life forms on other planets or in space.
BIOAVAILABLE	• bioavailable adj. Able to be absorbed by a living organism. • bio-available adj. Alternative spelling of bioavailable. • BIOAVAILABLE adj. relating to bioavailability.
THIOALCOHOLS	• thioalcohols n. Plural of thioalcohol. • THIOALCOHOL n. another name for a thiol.

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: 54 words
Scrabble in French: 7 words
Scrabble in Spanish: 2 words
Scrabble in Italian: 20 words
Scrabble in German: no word
Scrabble in Romanian: 454 words

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