/ Dictionary / Index H helmet: Meaning and Definition of Find definitions for: hel•met Pronunciation: (hel'mit), [key] — n. any of various forms of protective head covering worn by soldiers, firefighters, divers, cyclists, etc. medieval armor for the head. (in fencing, singlestick, etc.) a protective device for the head and face consisting of reinforced wire mesh. anything resembling a helmet in form or position. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: helmet (Thesaurus) Helmand helmeted guinea fowl Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language