[ al-kuh-lahyn, -lin ]
/ ˈæl kəˌlaɪn, -lɪn /

adjective Chemistry.

of or like an alkali.
containing an alkali.
having the properties of an alkali.
having a pH value greater than 7.Compare acid(def 5c).

Origin of alkaline

First recorded in 1670–80; alkal(i) + -ine1 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for alkaline

British Dictionary definitions for alkaline

/ (ˈælkəˌlaɪn) /


having the properties of or containing an alkali
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

Medical definitions for alkaline

[ ălkə-lĭn, -līn′ ]


Of, relating to, or containing an alkali.
Having a pH greater than 7.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for alkaline

[ ălkə-lĭn, -līn′ ]

Capable of neutralizing an acid. Bases are alkaline.
Relating to an alkali compound.
Having a pH greater than 7.
Having a relatively low concentration of hydrogen ions.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.