1. Prefix denoting before, forward. SEE ALSO: ante-, pre-. 2. In chemistry, prefix indicating precursor of. SEE ALSO: -gen. [L. and G. pro]
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prefix denoting
1. before; preceding.
2. a precursor.
3. in front of.
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[L. and Gr. “beforeâ€] 1. a prefix signifying before or in front of. 2. a prefix denoting a precursor, as of an enzyme or hormone.Medical dictionary. 2011.