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Dictionary

bo'ron car'bide

Chem.
a black, crystalline, extremely hard, water-insoluble solid, B₄C, used chiefly as a moderator in nuclear reactors, as an abrasive, and as a refractory.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

boron

boron hydride

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