Definition of em- in English:

em-

Pronunciation: /ɪm, ɛm/

prefix

Variant spelling of en-1, en-2 assimilated before b, p (as in emblazon, emplacement).

Definition of em- in:

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