Reference meaning
Ar
Last updated
a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere
Related source terms
argonatomic number 18
Other meanings
2. noun
a unit of surface area equal to 100 square meters
3. noun
a state in south central United States; one of the Confederate states during the American Civil War
Source and scope
This definition is reproduced from Princeton WordNet 3.0, sense 14628920-n, under the WordNet 3.0 License. It has not yet received VocabularyBase editorial review. Read the source and license details.