pro–

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1. Acting in the place of; substituting for: proform.
2. Supporting; favoring: prorevolutionary.

[Middle English, from Old French, from Latin pro-, prō-, from prō, for.]

1. 1. Earlier; before; prior to: procambium.
   2. Rudimentary: pronucleus.
2. Anterior; in front of: procephalic.

[Middle English, from Old French, from Greek, from pro, before, in front.]

1. Earlier; before; prior to: progenitor.
2. Rudimentary: pronucleus.
3. Anterior; in front of: procephalic.