Noun

1. A marine mollusc of the family Strombidae which lives in its own spiral shell.
2. The shell of this sea animal.
3. A musical instrument made from a large spiral seashell.
4. A machine (rather like a rotating pestle and mortar) used to develop the flavour and texture of chocolate by warming and grinding; a concher or concher machine.

Verb

1. To refine the flavour and texture of chocolate by warming and grinding, either in a traditional concher, or between rollers.
2. To play a conch seashell as a musical instrument, by blowing through a hole made close to the origin of the spiral.