Ar - Definition

n 1: a colorless and odorless inert gas; one of the six inert
gases; comprises approximately 1% of the earth's atmosphere
[syn: argon, Ar, atomic number 18]
2: a unit of surface area equal to 100 square meters [syn:
are, ar]
3: a state in south central United States; one of the
Confederate states during the American Civil War [syn:
Arkansas, Land of Opportunity, AR]