/ Dictionary / Index H hair trigger: Meaning and Definition of Find definitions for: hair' trig"ger Pronunciation: [key] a trigger that allows the firing mechanism of a firearm to be operated by very slight pressure. hair-trig•ger Pronunciation: (hâr'trig"ur), [key] — adj. easily activated or set off; reacting immediately to the slightest provocation or cause: a hair-trigger temper. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hair transplant hairweaving Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language