casque

[kask]
noun
1.
an open, conical helmet with a nose guard, commonly used in the medieval period.
2.
any helmet-shaped head covering.
3.
Zoology. a process or formation on the head, resembling a helmet.

Origin:
1570–80; < Middle French < Spanish casco helmet, head, earthen pot; akin to cascara

casqued [kaskt] , adjective
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World English Dictionary
casque (kæsk)
 
n
zoology a helmet or a helmet-like process or structure, as on the bill of most hornbills
 
[C17: from French, from Spanish casco; see cask]
 
casqued
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

casque
"armor for the head," 1580, from Fr., see cask.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
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.
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