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argon British & World English

The chemical element of atomic number 18, an inert gaseous element of the noble gas group. Argon is the commonest noble gas, making up nearly one per cent of the earth’s atmosphere

argon New Oxford Dictionary for Writers & Editors

chemical element of atomic number 18, a noble gas

Ar in argon British & World English

The chemical element of atomic number 18, an inert gaseous element of the noble gas group. Argon is the commonest noble gas, making up nearly one per cent of the earth’s atmosphere

potassium–argon dating British & World English

A method of dating rocks from the relative proportions of radioactive potassium-40 and its decay product, argon-40