(1):

(n.) A genus of fossil echini, having a vaulted, helmet-shaped shell.

(2):

(n.) The upper lip or helmet-shaped part of a labiate flower.

(3):

(n.) A kind of bandage for the head.

(4):

(n.) Headache extending all over the head.

(5):

(n.) The anterior, outer process of the second joint of the maxillae in certain insects.