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[an-tuh-moh-nee] /ˈæn təˌmoʊ ni/
noun, Chemistry
a brittle, lustrous, white metallic element occurring in nature free or combined, used chiefly in alloys and in compounds in medicine. Symbol: Sb; atomic number: 51; atomic weight: 121.75.
late Middle English
1375-1425; late Middle English antimonie < Medieval Latin antimōnium, perhaps < dialectal Arabic uthmud
Related forms
antimonial, adjective, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for antimony
  • The region is also rich in antimony, gold, zinc and tin.
  • Statistics and information on the worldwide supply, demand, and flow of antimony.
  • It is decomposed slowly by water to hydrochloric acid and antimony oxychloride.
British Dictionary definitions for antimony


a toxic metallic element that exists in two allotropic forms and occurs principally in stibnite. The stable form is a brittle silvery-white crystalline metal that is added to alloys to increase their strength and hardness and is used in semiconductors. Symbol: Sb; atomic no: 51; atomic wt: 121.757; valency: 0, –3, +3, or +5; relative density: 6.691; melting pt: 630.76°C; boiling pt: 1587°C
Word Origin
C15: from Medieval Latin antimōnium, of uncertain origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for antimony
brittle metallic element, late 15c., from M.L. antimonium, an alchemist's term (used 11c. by Constantinus Africanus), origin obscure, probably a Latinization of Gk. stimmi, from some Arabic word (cf. 'othmud), unless the Arabic word is from the Gk.; probably ult. from Egyptian stm "powdered antimony" (used to paint the eyelids). In folk etymology, anti-moine "monk's bane" (from Fr. moine). As a pure element, it is attested from 1788; chemical symbol Sb is for Stibium.
Online Etymology Dictionary, © 2010 Douglas Harper
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antimony in Medicine

antimony an·ti·mo·ny (ān'tə-mō'nē)
Symbol Sb
An element having several allotropes, the most common of which is a brittle, silver-white crystalline metal. It is used in alloys and in flame-proofing compounds. Atomic number 51; atomic weight 121.76; melting point 630.6°C; boiling point 1,587°C; specific gravity 6.691; valence 3, 5.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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antimony in Science
Symbol Sb
A metalloid element having many forms, the most common of which is a hard, very brittle, shiny, blue-white crystal. It is used in a wide variety of alloys, especially with lead in car batteries, and in the manufacture of flameproofing compounds. Atomic number 51; atomic weight 121.76; melting point 630.5°C (1,167°F); boiling point 1,380°C (2,516°F); specific gravity 6.691; valence 3, 5. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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