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.

1375–1425; late Middle English antimonie < Medieval Latin antimōnium, perhaps < dialectal Arabic uthmud

antimonial, adjective, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
antimonial (ˌæntɪˈməʊnɪəl)
1.  of or containing antimony
2.  a drug or agent containing antimony

antimony (ˈæntɪmənɪ)
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
[C15: from Medieval Latin antimōnium, of uncertain origin]

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Word Origin & History

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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American Heritage
Medical Dictionary

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.

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American Heritage
Science Dictionary
antimony   (ān'tə-mō'nē)  Pronunciation Key 
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.
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