The glans penis.
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.
The feature above a shield on a coat of arms.
A hard, protective head covering, typically part of armour.
A contemptible or stupid person.
The upper part of a chemist's retort.
To cover with, or as if with, a helmet.
The glans penis
Used other than figuratively or idiomatically: see knob, end. The end of something that is shaped into a knob.
A stupid or contemptible person