Definition of im- in English:

im-

Pronunciation: /ɪm, ɛm/

prefix

Variant spelling of in-1, in-2 assimilated before b, m, p (as in imbibe, immure, impart).

Definition of im- in:

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Word of the day vituperate
Pronunciation: vəˈt(y)o͞opəˌrāt
verb
blame or insult (someone) in strong language...