Definition of over- in English:

over-

Syllabification: over-

prefix

1Excessively; to an unwanted degree: overambitious overcareful
1.1Completely; utterly: overawe overjoyed
2Upper; outer; extra: overcoat overtime
2.1Overhead; above: overcast overhang

Definition of over- in:

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Word of the day envenom
Pronunciation: enˈvenəm
verb
put poison on or into; make poisonous