1. sb(n = noun.substance) antimony, atomic number 51 - a metallic element having four allotropic forms; used in a wide variety of alloys; found in stibnite;
is a kind of metal, metallic element
2. sb(n = noun.communication) bachelor of science, bs - a bachelor's degree in science;
is a kind of baccalaureate, bachelor's degree
sb, symb. Chem. the element antimony.
Etymology:
L stibium