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boron carbide

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WordReference Random House Unabridged Dictionary of American English © 2026

bo′ron car′bide, [Chem.]

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

Collins Concise English Dictionary © HarperCollins Publishers::

boron carbide

a black extremely hard inert substance having a high capture cross section for thermal neutrons. It is used as an abrasive, refractory, and in control rods in nuclear reactors. Formula: B₄C

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