a colorless crystalline compound, B 2 O 3 , used in metallurgy and chemical analysis.
a compound consisting of two elements of which boron is the more electronegative one. noun a compound in which boron is the most electronegative element, esp a compound of boron and a metal
causing or marked by boredom: a boring discussion; to have a boring time. Machinery. the act or process of making or enlarging a hole. the hole so made. Geology. a cylindrical sample of earth strata obtained by boring a vertical hole. borings, the chips, fragments, or dust produced in boring. to weary by dullness, tedious […]
Metalworking. a bar holding a tool for boring a cylinder or the like. Historical Examples Modern Machine-Shop Practice, Volumes I and II Joshua Rose Turning and Boring Franklin D. Jones Turning and Boring Franklin D. Jones Turning and Boring Franklin D. Jones Turning and Boring Franklin D. Jones Turning and Boring Franklin D. Jones Turning […]
Metalworking. a machine for boring holes in which the cutter is rotated, usually about a horizontal axis.