Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun ar

3 senses of ar

Sense 1
argon, Ar, atomic number 18 -- (a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere)
       => chemical element, element -- (any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter)
       => noble gas, inert gas, argonon -- (any of the chemically inert gaseous elements of the helium group in the periodic table)

Sense 2
are, ar -- (a unit of surface area equal to 100 square meters)
       => area unit, square measure -- (a system of units used to measure areas)

Sense 3
Arkansas, Land of Opportunity, AR -- (a state in south central United States; one of the Confederate states during the American Civil War)
       INSTANCE OF=> American state -- (one of the 50 states of the United States)