a combining form meaning “milk,” used in the formation of compound words (lactometer ); specialized in chemical terminology to mean “lactate,” or “lactic acid.”
Also, lacti-; especially before a vowel, lact-.

< Latin lact- (stem of lac milk) + -o- Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lacto- or (before a vowel) lact-
combining form
indicating milk: lactobacillus
[from Latin lact-, lac milk]
lact- or (before a vowel) lact-
combining form
[from Latin lact-, lac milk]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

lacto- or lact- or lacti-

  1. Milk: lactoglobulin.

  2. Lactose: lactase.

  3. Lactic acid: lactate.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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