Function: noun
Date: circa 1909
: a refractory shiny black crystalline compound B 4 C that is one of the hardest known materials and is used especially in abrasives and as a structural reinforcing material
Function: noun
Date: circa 1909
: a refractory shiny black crystalline compound B 4 C that is one of the hardest known materials and is used especially in abrasives and as a structural reinforcing material
Merriam Webster Collegiate English Dictionary. Merriam Webster - Энциклопедический словарь английского языка. 2012