an open, conical helmet with a nose guard, commonly used in the medieval period.
any helmet-shaped head covering.
a process or formation on the head, resembling a helmet.
helmet, head, earthen pot; akin to
a helmet or a helmet-like process or structure, as on the bill of most hornbills
[C17: from French, from Spanish
Collins English Dictionary - Complete & Unabridged 10th Edition
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The distinctive structure at the top of the bill, called a casque, helps hornbills project their harsh call cross the canopy.
Also unclear is the function of the odd, finlike casque that sits atop its brilliant blue head and neck.
The casque would help protect the skull from such collisions.