chapiteau

Etymology
, from (likely a semi-learned borrowing), from, ultimately from , whence also French. , borrowings from Occitan, and, a borrowing from Spanish.

Noun

 * 1) a circus tent, or any similar set-up used for spectacles or events
 * 2)  the capital of a column, baluster or similar structure
 * 3)  the conical part at the front end of a rocket
 * 4)  the top part of an alembic, where condensation occurs