/ Dictionary / Index T thinner: Meaning and Definition of Find definitions for: thin•ner Pronunciation: (thin'ur), [key] — n. a volatile liquid, as turpentine, used to dilute paint, varnish, rubber cement, etc., to the desired or proper consistency. a person who adds thinners to paints, varnishes, etc. a person who specializes in weeding plants, pruning shrubbery, thinning fruit, etc. thin•ner Pronunciation: (thin'ur), [key] — adj. comparative of Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thinner (Thesaurus) thin-layer chromatography thinnish Related Content Daily Word Quiz: belligerent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language