• synonyms


[al-kuh-lahyn, -lin]
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adjective Chemistry.
  1. of or like an alkali.
  2. containing an alkali.
  3. having the properties of an alkali.
  4. having a pH value greater than 7.Compare acid(def 5c).
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Origin of alkaline

First recorded in 1670–80; alkal(i) + -ine1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for alkaline

soluble, salty, acrid, alkali, bitter, caustic, alkalescent, antacid

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Contemporary Examples of alkaline

Historical Examples of alkaline

British Dictionary definitions for alkaline


  1. having the properties of or containing an alkali
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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

Word Origin and History for alkaline


1670s, "pertaining to alkalis," from alkali + -ine (1). Of soils, attested from 1850.

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Online Etymology Dictionary, © 2010 Douglas Harper

alkaline in Medicine


(ălkə-lĭn, -līn′)
  1. Of, relating to, or containing an alkali.
  2. Having a pH greater than 7.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

alkaline in Science


[ălkə-lĭn, -līn′]
  1. Capable of neutralizing an acid. Bases are alkaline.
  2. Relating to an alkali compound.
  3. Having a pH greater than 7.
  4. Having a relatively low concentration of hydrogen ions.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.