Quid has several meanings:

• A small, circular item similar to a dollar; for example, sand dollars
• Slang (British) for one Pound Sterling (£). The Irish pound was also referred to by this name. Can also refer to Euro currency in Ireland.
• A French thematic encyclopedia, published annually by Robert Laffont .
• An abbreviation of the Latin tertium quid, meaning "third party" and used to denote an anti-Madison part of the United States Republican Party between 1805 and 1811.
• A piece of tobacco, small enough to be chewed.