Definition of aceto- in English:

aceto-

Pronunciation: /əˈsiːtəʊ, ˈasɪtəʊ/
(also acet- before a vowel)

combining form

Chemistry
Representing acetic acid or acetyl.

Definition of aceto- in:

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Word of the day animalcule
Pronunciation: ˌanɪˈmalkjuːl
noun
a microscopic animal