Noun

(en noun)

A pair of headphones or earphones, or a singular headphone or earphone, typically with an attached microphone.

Any electronic device worn on the head.

* '>citation

(cycling) On a bicycle, the system of bearings that connects the fork to the frame.

Noun

(en noun)

A protective head covering.

* {{quote-book, year=1963, author=(Margery Allingham)

, title=(The China Governess) , chapter=2 citation , passage=Now that she had rested and had fed from the luncheon tray Mrs. Broome had just removed, she had reverted to her normal gaiety.  She looked cool in a grey tailored cotton dress with a terracotta scarf and shoes and her hair a black silk helmet .}}

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.

# (heraldry) The feature above a shield on a coat of arms.