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 hairdo

A hood; a close-fitting cap covering much of the head, widespread until XVIII century; after that worn only by small children and countrywomen

An item of chain mail headgear

An official headdress, such as that worn by certain judges in England.

* H. Brocke

From point and saucy ermine down / To the plain coif and russet gown.

* Francis Bacon

The judges, althout they are not of the first magnitude, nor need be of the degree of the coif , yet are they considerable.