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.

1400–50; late Middle English < Middle French healmet, helmet, diminutive of helme helm2

helmeted, adjective
helmetlike, adjective
unhelmeted, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To helmet
World English Dictionary
helmet (ˈhɛlmɪt)
1.  a piece of protective or defensive armour for the head worn by soldiers, policemen, firemen, divers, etc
2.  biology a part or structure resembling a helmet, esp the upper part of the calyx of certain flowers
[C15: from Old French, diminutive of helme, of Germanic origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Word Origin & History

1470, from M.Fr. helmet, dim. of helme "helmet," from Frank. *helm (cf O.H.G. helm "helmet"), from P.Gmc. *khelmaz, from PIE *kel- "to cover, to hide" (see cell). O.E. had helm, but it never was an active word.
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
Bible Dictionary

Helmet definition

(Heb. kob'a), a cap for the defence of the head (1 Sam. 17:5, 38). In the New Testament the Greek equivalent is used (Eph. 6:17; 1 Thess. 5:8). (See ARMS.)

Easton's 1897 Bible Dictionary
Cite This Source
Encyclopedia Britannica


defensive covering for the head, one of the most universal forms of armour. Helmets are usually thought of as military equipment, but they are also worn by firemen, miners, construction workers, riot and motorcycle police, gridiron-football and ice-hockey players, and bicyclists.

Learn more about helmet with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
Cite This Source
Example sentences
The beach cruiser bikes come fully loaded with helmet, basket, and total
On his lips he wore white sun block, and on his head a fighter pilot's helmet,
  complete with a transceiver.
We are briefed on helicopter safety and given a helmet with a cord to plug into
  the helicopter's voice system.
The watchman was fitted out with a helmet, gorget and a cloak.
Images for helmet
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature