English Reference
noun

lactate

n.
US /ˈɫækteɪt/ UK /lˈækteɪt/ lac·tate UK spelling lactated, lactates, lactating

  1. 01 C1 Advanced TechnicalAcademic Science

    a substance your body produces, especially during hard exercise.

    any salt or ester of lactic acid; specifically the conjugate base of lactic acid produced during anaerobic metabolism.

    Simple

    Athletes often monitor their lactate levels to see how hard they are training.

    In context

    During high-intensity interval training, the accumulation of blood lactate can serve as a marker for the anaerobic threshold.

    Usage

    Usually treated as an uncountable noun when referring to the substance in the blood.

    lactic acid salt

Men attempting to lactate to feed a baby is child abuse.

BreakingNews.ie· 29 Aug 2026

Etymology 1

Borrowed from Latin lactātus, perfect passive participle of lactō (“to suckle, give suck, contain milk”) (see -ate (verb-forming suffix)), from lac (“milk”), cognate to Ancient Greek γάλα (gála, “milk”).

Etymology 2

From lactic acid + -ate (“salt or ester”).

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin Latin lactātus
Level C1 · Advanced
Frequency Occasional
Updated