WordReference Random House Unabridged Dictionary of American English © 2026
lacto-, 
  1. 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-;
 [esp. before a vowel,] lact-. 
  • Latin lact- (stem of lac milk) + -o-

Collins Concise English Dictionary © HarperCollins Publishers::
lacto-, (before a vowel) lact- combining form
  1. indicating milk: lactobacillus
Etymology: from Latin lact-, lac milk
'lacto-' also found in these entries (note: many are not synonyms or translations):
lactate - lacto-vegetarian - vegetarian - lact- - lacti- - lactobacillus - lactoferrin - lactoflavin - lactogenic - lactometer - lacto-ovo-vegetarian - lactoprotein - lactoscope - lactovegetarian - ovolactarian - ovo-lacto-vegetarian

Forum discussions with the word(s) "lacto-" in the title:


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