-ide

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Group of related chemical compounds: monosaccharide.
2. n. Binary compound: sodium chloride, hydrogen cyanide.
3. n. Chemical element with properties similar to another: lanthanide.

Wiktionary

1. n. any of a group of related compounds - azide, polysaccharide, glycoside
2. n. a binary compound of a nonmetal - bromide, arsenide
3. n. any of a group of several elements - lanthanide

GNU Webster's 1913

1. (Chem.) A suffix used to denote: (a) The nonmetallic, or negative, element or radical in a binary compound. (b) A compound which is an anhydride. (c) Any one of a series of derivatives