antimony

an·ti·mo·ny

noun \ˈant-ə-ˌmō-nē\

plural an·ti·mo·nies

Definition of ANTIMONY

: a trivalent and pentavalent metalloid element that is commonly metallic silvery white, crystalline, and brittle and is used especially in alloys and semiconductors and in medicine as a constituent of various antiprotozoal agents (as tartar emetic)—symbol Sb; see element table