4 occurrences in 4 dictionaries
Reference: Helmet
Easton
(Heb kob'a), a cap for the defence of the head (1Sa 17:5,38). In the New Testament the Greek equivalent is used (Eph 6:17; 1Th 5:8). (See Armour.)
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Hastings
Morish
For the protection of the head, as worn by warriors. See ARMOUR. In the Christian's armour the helmet is 'salvation,' or 'the hope of salvation.' Eph 6:17; 1Th 5:8. It is those who know their salvation that can take part against the wicked spirits in the heavenlies. It is to be remarked that Jehovah (Christ) in a future day will Himself put on righteousness as a breastplate, and a helmet of salvation, to avenge His people by punishing their enemies. Isa 59:17.
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Smith
Helmet.
[ARMS]
See Arms, Armor