ˈ ̷ ̷ˌ ̷ ̷ noun
1.
a. : any of various close-fitting brimless cloth caps for indoor or outdoor wear — compare beanie , calot , yarmulke , zucchetto
b. : a close-fitting steel or iron helmet
2. : a plant of the genus Scutellaria having a calyx that when inverted resembles a helmet with the visor raised
3. : a domed capping layer (as of rock)
4. : the top of the skull : calvarium