/ Dictionary / Index U underclothes: Meaning and Definition of Find definitions for: un•der•clothes Pronunciation: (un'dur-klōz", -klōz"), [key] — n. (used with a pl. v.) clothes worn under outer clothes. underwear. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: underclothes (Thesaurus) underclassman undercoat Related Content Daily Word Quiz: inutiae Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language