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There are 4 nine-letter words beginning with TRIO

TRIOLEINS• TRIOLEIN n. a glyceride of oleic acid, also OLEIN, OLEINE, ELAIN.
TRIONYMAL• trionymal adj. Synonym of trionymous.
• TRIONYMAL adj. relating to a trionym.
TRIOXIDES• trioxides n. Plural of trioxide.
• TRIOXIDE n. an oxide containing three atoms of oxygen; as, sulphur trioxide, also TRIOXID.
TRIOXYGEN• trioxygen n. (Inorganic chemistry) ozone (the triatomic allotrope of oxygen).
• TRIOXYGEN n. a technical name for oxygen.

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 1Word.ws and WikWik.org.

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