/ Dictionary / Index H hairspring: Meaning and Definition of Find definitions for: hair•spring Pronunciation: (hâr'spring"), [key] — n. Horol. a fine, usually spiral, spring used for oscillating the balance of a timepiece. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hairspring (Thesaurus) hair spray hairstreak Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language