helmet /ˈhɛlmɪt/noun 7verb 1forms 5phrases 1 noun7 •a strong cover worn on the head to keep it safe from hard hits, used by soldiers and ridersMost speedboarders wear helmets, knee and elbow pads, and occasionally all-in-one aerodynamic suits, to protect themselves. — 2009 •That which resembles a helmet in form, position, etc. •The upper part of a chemist's retort. •The hood-shaped upper sepal or petal of some flowers, as of the monkshood or the snapdragon. •A naked shield or protuberance on the top or fore part of the head of a bird. •(slang) The glans penis.And it makes me sick, the thought of your lipstick on his helmet. — 1998 •(offensive) A contemptible or stupid person.Jarvo’s a stinky old helmet. — 2021 verb1 •To cover with, or as if with, a helmet.There was no nonsense about these women—no hysteria, no top-note emotion. They were not out for smashing windows or helmetting policemen, or blowing up things sky-high. — 1913 formshelmeted · helmetted · helmeting · helmetting · helmets Phrases with helmet helmet hairAn accidental messy hairdo resulting from the wearing of a helmet.