Definition of mal- in English:

mal-

combining form

1In an unpleasant degree: malodorous
2In a faulty or inadequate manner: malfunction malnourishment
2.1In an improper manner: malpractice
3Not: maladroit

Origin

from French mal, from Latin male 'badly'.

Definition of mal- in:

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