[uh-mohn-yuh, uh-moh-nee-uh]
noun Chemistry.
a colorless, pungent, suffocating, highly water-soluble, gaseous compound, NH 3 , usually produced by the direct combination of nitrogen and hydrogen gases: used chiefly for refrigeration and in the manufacture of commercial chemicals and laboratory reagents.
Also called ammonia solution, ammonia water, aqua ammoniae, aqua ammonia, aqueous ammonia. this gas dissolved in water; ammonium hydroxide.

1790–1800; < Neo-Latin, so called as being obtained from sal ammoniac. See ammoniac Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ammonia (əˈməʊnɪə, -njə)
1.  a colourless pungent highly soluble gas mainly used in the manufacture of fertilizers, nitric acid, and other nitrogenous compounds, and as a refrigerant and solvent. Formula: NH3
2.  a solution of ammonia in water, containing the compound ammonium hydroxide
[C18: from New Latin, from Latin (sal) ammōniacus (sal) ammoniac1]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1799, coined 1782 by Swedish chemist Torbern Bergman (17351784) for gas obtained from sal ammoniac, salt deposits containing ammonium chloride found near temple of Jupiter Ammon (from Egyptian God Amun) in Libya, from Gk. ammoniakon "belonging to Ammon." The shrine was already ancient in Augustus' day,
and the salts were prepared "from the sands where the camels waited while their masters prayed for good omens" [Shipley]. There also was a gum form of sal ammoniac, from a wild plant that grew near the shrine, and across North Africa and Asia. A less likely theory traces the name to Gk. Armeniakon "Armenian," since the substance also was found in Armenia. Also known as Spirit of Hartshorn and Volatile or Animal Alkali.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

ammonia am·mo·nia (ə-mōn'yə)
A colorless, pungent gas used to manufacture a wide variety of nitrogen-containing organic and inorganic chemicals.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
ammonia   (ə-mōn'yə)  Pronunciation Key 
A colorless alkaline gas that is lighter than air and has a strongly pungent odor. It is used as a fertilizer and refrigerant, in medicine, and in making dyes, textiles, plastics, and explosives. Chemical formula: NH3.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
If the gas is dissolved in water, it is called liquid ammonia.
The process takes several months and results in a pungent dish that reeks of
  fish and ammonia.
The ammonia dissolves into the water, and the butane condenses into liquid,
  which sits atop the water-ammonia mixture.
Ammonium hydroxide is a colorless liquid chemical solution that forms when
  ammonia dissolves in water.
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