Definition of lacto- in English:

lacto-

Pronunciation: /ˈlaktəʊ/

combining form

1Relating to milk: lactoscope
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 noisome
Pronunciation: ˈnɔɪs(ə)m
adjective
having an extremely offensive smell