noun
- an open, conical helmet with a nose guard, commonly used in the medieval period.
- any helmet-shaped head covering.
- Zoology. a process or formation on the head, resembling a helmet.
noun
- zoology a helmet or a helmet-like process or structure, as on the bill of most hornbills
n.
“armor for the head,” 1570s, from French casque (see cask).