Definitions
1.NounA hard, protective head covering, typically part of armour.
2.Noun(Can we verify this sense?) Such a helm when placed above a shield on a coat of arms.
3.NounThat which resembles a helmet in form, position, etc.
The upper part of a chemist's retort.
4.NounThe upper part of a chemist's retort.
5.NounThe hood-shaped upper sepal or petal of some flowers, as of the monkshood or the snapdragon.
6.NounA naked shield or protuberance on the top or fore part of the head of a bird.
7.NounThe glans penis.
8.NounA contemptible or stupid person.
9.VerbTo cover with, or as if with, a helmet.