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.

Noun

(en noun)

A monk's hood or hooded robe

* Alexander Pope

What differ more, you cry, than crown and cowl ?

A mask that covers the majority of the head.

A thin protective covering over all or part of an engine; also cowling

A usually hood-shaped covering used to increase the draft of a chimney and prevent backflow.

(nautical) A ship's ventilator with a bell-shaped top which can be swivelled to catch the wind and force it below

(nautical) A vertical projection of a ship's funnel that directs the smoke away from the bridge

(obsolete, British) A soe