[ thin-er ]
/ ˈθɪn ər /


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.

Origin of thinner

First recorded in 1825–35; thin + -er1

Definition for thinner (2 of 3)

[ thin-er ]
/ ˈθɪn ər /


comparative of thin.

Definition for thinner (3 of 3)

Origin of thin

before 900; (adj. and adv.) Middle English thyn(ne), Old English thynne; cognate with Dutch dun, German dünn, Old Norse thunnr; (v.) Middle English thynnen, Old English thynnian, derivative of the adj.; compare Middle Dutch dunnen, Old Norse thynna; akin to Old Irish tana, Latin tenuis thin, Greek tany- long


3 slim, slender, skinny, lank, scrawny. Thin, gaunt, lean, spare agree in referring to one having little flesh. Thin applies often to one in an unnaturally reduced state, as from sickness, overwork, lack of food, or the like: a thin, dirty little waif. Gaunt suggests the angularity of bones prominently displayed in a thin face and body: to look ill and gaunt. Lean usually applies to a person or animal that is naturally thin: looking lean but healthy after an outdoor vacation. Spare implies a muscular leanness with no diminution of vitality: Lincoln was spare in body.
5 meager.
8 weak.

OTHER WORDS FROM thin Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for thinner

British Dictionary definitions for thinner (1 of 2)

/ (ˈθɪnə) /


(often plural, functioning as singular) a solvent, such as turpentine, added to paint or varnish to dilute it, reduce its opacity or viscosity, or increase its penetration into the ground

British Dictionary definitions for thinner (2 of 2)

/ (θɪn) /

adjective thinner or thinnest


in order to produce something thinto cut bread thin

verb thins, thinning or thinned

to make or become thin or sparse

Derived forms of thin

thinly, adverbthinness, noun

Word Origin for thin

Old English thynne; related to Old Frisian thenne, Old Saxon, Old High German thunni, Old Norse thunnr, Latin tenuis thin, Greek teinein to stretch
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Idioms and Phrases with thinner


The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.