from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Ecclesiastical A skullcap, especially one worn by Roman Catholic priests.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a skullcap worn by Roman Catholic priests
- n. The vertical central area of the crown of a bird's head.
- n. A round cavity or depression, in the form of a cup or cap, lathed and plastered; used to diminish the rise or elevation of a moderate chapel, alcove, etc. which would otherwise be too high for other pieces of the apartment.
- n. The upper (superior) or lower (inferior) half of the globe of the eye.
from the GNU version of the Collaborative International Dictionary of English
- n. Such a cap, worn by English serjeants at law.
- n. Such a cap, worn by the French cavalry under their helmets.
- n. Such a cap, worn by the clergy of the Roman Catholic Church.
from The Century Dictionary and Cyclopedia
- n. A plain skull-cap or coif of haircloth, satin, or other fabric, worn by the Roman Catholic clergy to cover the tonsure when exposed to drafts;
- n. in England, by serjeants-at-law on their wigs.
- n. In armor and costume, that part of any head-dress which covers closely the crown of the head: as, the calotte of the helmet.
- n. Anything having the form of a small cap, as the cap of a sword-hilt.
- n. In architecture, a dome or cupola, or something of similar form, as a cup-shaped ceiling, the head of an alcove, etc.
- n. In ornithology, a hood or cap of color upon the top of a bird's head.
- n. Also written calote and callot.
- n. In geology, an ice-cap or a glacier covering a large land area.
- n. In zoology: The pole of attachment of Dicyemidæ which are parasitic in the kidneys of certain cephalopods; the polar cap.
- n. In Polyzoa, a retractile disk formed at the aboral pole in the developing larva.
French, from Provençal calota or Italian callotta.(American Heritage® Dictionary of the English Language, Fourth Edition)
French calotte, diminutive of calot, from écale ("husk, shell (of a nut)") (due to similar shape and closely fitting the head), from Old French escale, from Old High German scāla (cognate to English scale). (Wiktionary)