Main Entry:

an·ti·mo·ny

Pronunciation:

\ˈan-tə-ˌmō-nē\

Function:

noun

Etymology:

Middle English antimonie, from Medieval Latin antimonium

Date:

15th century

1 : stibnite 2 : a trivalent and pentavalent metalloid element that is commonly metallic silvery white, crystalline, and brittle and that is used especially in alloys, semiconductors, and flame-retardant substances — see element table