• A pound sterling (£), in British slang, possibly derived from the Royal mint at Quidhampton, Wiltshire, England, but more likely from the Latin phrase 'Quid pro quo' (This for that) meaning an exchange of goods.
• A euro (€), in Irish slang
• An Irish punt or Australian pound (no longer issued)
• Quid (encyclopedia), a French encyclopedia
• Quantitative Ingredient Declaration (QUID) On Food Labelling
• An abbreviation of the Latin "tertium quid", meaning "third party" and used to denote an anti-Madison part of the Democratic-Republican Party of the United States between 1805 and 1811
• Quasi Universal Intergalactic Denomination
• Quidding, a dental problem sometimes found in horses where the animal drops partially chewed food while chewing, or chews with the mouth open
• Quid.co.il is an israeli information specialists and librarians website

References