| Noun | 1. | binary compound - chemical compound composed of only two elements common salt, sodium chloride - a white crystalline solid consisting mainly of sodium chloride (NaCl) ammonia - a pungent gas compounded of nitrogen and hydrogen (NH3) calcium carbide - a grey salt of calcium (CaC) used in making acetylene chemical compound, compound - (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight H2O, water - binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid; freezes into ice below 0 degrees centigrade and boils above 100 degrees centigrade; widely used as a solvent hydride - any binary compound formed by the union of hydrogen and other elements |