Definitions for lacto-
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Random House Webster's College Dictionary
lacto-
a combining form meaning “milk” (lactometer) or “lactic acid” (lactobacillus).
Category: Affix
Ref: Also, lacti- ;esp. before a vowel, lact-.
Origin of lacto-:
< L lact-, s. of lac milk + -o -
Wiktionary
lacto-(Prefix)
denoting a connection to milk.
Origin: From lac.
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