Name of a radioactive substance resembling and being a product of the disintegration of thorium obtained from uranium minerals, but no atomic weight has yet been assigned to it. Aqueous solutions of its salts slowly evolve hydrogen and oxygen:n the proportions in which they exist in water. “ADAMANTINE”A proprietary brand of fire and alkali proof material for use in sulphur, pyrites, zincblende, and other burners.

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Definition of  ACTINIUM