Definition of "conch"

A marine gastropod of the family Strombidae which lives in its own spiral shell.  examples

The shell of this sea animal.  examples

A musical instrument made from a large spiral seashell, somewhat like a trumpet.  examples

(architecture) The semidome of an apse, or the apse itself.  examples

Synonym of concher (“machine used to refine the flavour and texture of chocolate”)  examples

To refine the flavour and texture of chocolate by warming and grinding, either in a traditional concher, or between rollers.  examples

To play a conch seashell as a musical instrument, by blowing through a hole made close to the origin of the spiral.  examples