/ Dictionary / Index T Thessaly: Meaning and Definition of Find definitions for: Thes•sa•ly Pronunciation: (thes'u-lē), [key] — n. a region in E Greece: a former division of ancient Greece. 659,913; 5208 sq. mi. (14,490 sq. km). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thessaly (Thesaurus) Thessalonike theta Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language