Definition of oleo- in English:

oleo-

Pronunciation: /ˈəʊlɪəʊ, ˈɒlɪəʊ/

combining form

Relating to or containing oil: oleomargarine oleoresin

Origin

from Latin oleum 'oil'.

Definition of oleo- in:

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