radium A

American

noun

Chemistry.

a substance, formed by decay of radon, that gives rise to radium B.

Etymology

Origin of radium A

First recorded in 1900–05

Example Sentences

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radium A

Thus a zircon nucleus with a diameter of but 3.4 x 10-4 cms. formed a halo strongly darkened within, and showing radium A and radium C as clear smoky rings.

From The Birth-Time of the World and Other Scientific Essays by John Joly

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023