adjective
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Capable of neutralizing an acid. Bases are alkaline.
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Relating to an alkali compound.
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Having a pH greater than 7.
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Having a relatively low concentration of hydrogen ions.
Etymology
Origin of alkaline
Vocabulary lists containing alkaline
Chemistry - High School
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Chemistry - Middle School
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The rhenium component helped hydrogen attach to and release from the catalyst surface, while the molybdenum sped up the splitting of water in the alkaline electrolyte.
From Science Daily • May 18, 2026
More interesting for Bott than the climate benefit is the way calcium carbonate makes water more alkaline.
From The Wall Street Journal • May 14, 2026
The process - called alkaline hydrolysis - will offer families a third option instead of burial or traditional cremation.
From BBC • Mar. 2, 2026
The results were all over the map, but at least one finding was consistent: All but one of the properties showed evidence of high pH, or increased alkalinity, likely because ash is highly alkaline.
From Los Angeles Times • Apr. 24, 2025
When the soil is too alkaline, which can be thought of as being too sweet, you need to add sulfur.
From "Counting by 7s" by Holly Goldberg Sloan
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
