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.
According to the researchers, this represents the first use of their alkaline thermal treatment method to overcome all three problems at once.
From Science Daily ● Jul. 31, 2026
Essentia, the supercharged ionized alkaline water, was for models and Kardashians.
From The Wall Street Journal ● Jul. 29, 2026
The process - called alkaline hydrolysis - will offer families a third option instead of burial or traditional cremation.
From BBC ● Mar. 2, 2026
The site's pH of 12 makes it one of the most alkaline environments ever documented, creating conditions that are exceptionally difficult for life to endure.
From Science Daily ● Nov. 9, 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.
