Definition of pro- in English:

pro-

prefix

1Favouring; supporting: pro-choice
2Acting as a substitute or deputy for: proconsul
3Denoting motion forwards, out, or away: proceed propel prostrate

Origin

from Latin pro 'in front of, on behalf of, instead of, on account of'.

Definition of pro- in:

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