lactic acid

American  

noun

Biochemistry.

1. a colorless or yellowish, syrupy, water-soluble liquid, C 3 H 6 O 3 , produced during muscle contraction as a product of anaerobic glucose metabolism, abundant in sour milk, prepared usually by fermentation of cornstarch, molasses, potatoes, etc., or synthesized: used chiefly in dyeing and textile printing, as a flavoring agent in food, and in medicine.

---

lactic acid British  

noun

1. Systematic name: 2-hydroxypropanoic acid.  a colourless syrupy carboxylic acid found in sour milk and many fruits and used as a preservative ( E270 ) for foodstuffs, such as soft margarine, and for making pharmaceuticals and adhesives. Formula: CH 3 CH(OH)COOH

---

lactic acid Scientific  

/ lăk′tĭk /

1. A syrupy, water-soluble organic acid produced when milk sours or certain fruits ferment. It is also produced in the body during the anaerobic metabolism of glucose, as in muscle tissue during exercise, where its buildup can cause cramping pains. A synthetic form of lactic acid is used as a flavoring and preservative, in dyeing and textile printing, and in pharmaceuticals. Chemical formula: C ₃ H ₆ O ₃ .

---

Etymology

Origin of lactic acid

First recorded in 1780–90

Example Sentences

See Examples For:

lactic acid

How do I get that lactic acid out of my body - massages or ice baths?

From BBC ● Jul. 28, 2026

"We observed that sourdoughs develop into stable microbial ecosystems, with lactic acid bacteria and yeasts in a complex balance," he says.

From Science Daily ● Mar. 16, 2026

“You’ve got lactic acid up to your eyeballs,” Porino said.

From The Wall Street Journal ● Feb. 6, 2026

The lactic acid, after some time, will cause the dough to smell like beer.

From Salon ● Sep. 25, 2025

But he couldn’t feel any pain, didn’t feel the tightness of lactic acid coating his muscles.

From "We'll Fly Away" by Bryan Bliss