a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earths atmosphere
[ Syn: argon , argon , ar , ar , atomic number 18 , atomic number 18 ]
a unit of surface area equal to 100 square meters
[ Syn: are ]
a state in south central United States; one of the Confederate states during the American Civil War
[ Syn: arkansas , land of opportunity , ar ]