lactase

American  

[lak-tays, -tayz] / ˈlæk teɪs, -ˌteɪz /

noun

Biochemistry.

1. an enzyme capable of hydrolyzing lactose into glucose and galactose.

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lactase British  

/ ˈlækteɪs, -teɪz /

noun

1. any of a group of enzymes that hydrolyse lactose to glucose and galactose

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lactase Scientific  

/ lăk′tās′ /

1. An enzyme that is found in the small intestine, liver, and kidneys of mammals and catalyzes the breakdown of lactose into galactose and glucose.

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Etymology

Origin of lactase

First recorded in 1890–95; lact- + -ase

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Example Sentences

See Examples For:

lactase

People with low lactase levels are unable to absorb lactose in large quantities and are referred to as lactose malabsorbers.

From The Wall Street Journal ● Oct. 12, 2026

Using the new reference panel, they analyzed how a genomic variant of the lactase gene is related to traits such as height, body mass index and low-density lipoprotein cholesterol, also known as "bad cholesterol."

From Science Daily ● Nov. 7, 2023

But lactose is not fermentable, so it doesn’t get consumed by the yeast, which does not have the lactase enzyme and therefore is just as lactose-intolerant as any of your cheese-avoidant friends.

From Seattle Times ● Feb. 8, 2023

Someone who is lactose intolerant, "wouldn't put corn syrup on cereal instead of milk," he pointed out, "they buy milk with lactase added," referring to the enzyme that digests lactose.

From Salon ● Sep. 30, 2022

For example, lactase acts energetically upon ordinary lactose and all other β-galactosides; but not upon any glucoside, mannoside, etc.

From The Chemistry of Plant Life by Roscoe Wilfred Thatcher

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