(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.