boron-carbide

boron carbide

noun Chemistry.
a black, crystalline, extremely hard, water-insoluble solid, B 4 C, used chiefly as a moderator in nuclear reactors, as an abrasive, and as a refractory.
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boron carbide
 
n
a black extremely hard inert substance having a high capture cross section for thermal neutrons. It is used as an abrasive and refractory and in control rods in nuclear reactors. Formula: B4C

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