/ Dictionary / Index L Lettish: Meaning and Definition of Find definitions for: Let•tish Pronunciation: (let'ish), [key] — adj. of or pertaining to the Letts or their language. —n. Latvian (def. 3). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lettish (Thesaurus) Lettie lettre de cachet* Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language