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[uh-zee-uh-trohp, ey-zee-] /əˈzi əˌtroʊp, ˈeɪ zi-/
noun, Physical Chemistry
any liquid mixture having constant minimum and maximum boiling points and distilling off without decomposition and in a fixed ratio, as isopropyl alcohol and water.
1910-15; a-6 + Greek (ein) to boil + -o- + -trope
Related forms
[ey-zee-uh-trop-ik, -troh-pik] /ˌeɪ zi əˈtrɒp ɪk, -ˈtroʊ pɪk/ (Show IPA),
[ey-zee-o-truh-pee] /ˌeɪ ziˈɒ trə pi/ (Show IPA),
azeotropism, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for azeotrope
  • The coal was dried by distilling off some of the chlorobenzene-water azeotrope.
  • In addition to azeotrope formation, the single theoretical plate distillation technique suffers from inadequate separation.
  • It is an azeotrope, so it will not fractionate during operation.
  • The boiling points of the pure components must be sufficiently close to permit the formation of an azeotrope.
  • Although ethanol is soluble in water and actually forms an azeotrope, it can be sparged from the water.
British Dictionary definitions for azeotrope


a mixture of liquids that boils at a constant temperature, at a given pressure, without change of composition
Derived Forms
azeotropic (ˌeɪzɪəˈtrɒpɪk) adjective
Word Origin
C20: from a-1 + zeo-, from Greek zein to boil + -trope
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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azeotrope in Medicine

azeotrope a·ze·o·trope (ə-zē'ə-trōp', ā'zē-)
A liquid mixture of two or more substances that retains the same composition in the vapor state as in the liquid state when distilled or partially evaporated under a certain pressure.

a'ze·o·trop'ic (a'zē-ə-trŏp'ĭk, -trō'pĭk) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Article for azeotrope

in chemistry, a mixture of liquids that has a constant boiling point because the vapour has the same composition as the liquid mixture. The boiling point of an azeotropic mixture may be higher or lower than that of any of its components. The components of the solution cannot be separated by simple distillation.

Learn more about azeotrope with a free trial on
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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