Webster's Revised Unabridged Dictionary · 1913

Calotte

Calotte , noun

[French calotte, dim. of cale a sort of flat cap. Compare Caul.]

A close cap without visor or brim.
(a)
Such a cap, worn by English serjeants at law.
(b)
Such a cap, worn by the French cavalry under their helmets.
(c)
Such a cap, worn by the clergy of the Roman Catholic Church.
Collocations (1)
To assume the calotte , to become a priest.

Also: Callot