Definition of lacto- in English:

lacto-

Syllabification: lacto-

combining form

1Of or relating to milk: lactometer
2From or relating to lactic acid or lactose: lactobacillus

Origin

from Latin lac, lact- 'milk'.

Definition of lacto- in:

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Word of the day premonition
Pronunciation: ˌprēməˈniSHən
noun
a strong feeling that something will happen …