| The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. |
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| pro2 |
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| PREFIX: | 1a. Earlier; before; prior to: procambium. b. Rudimentary: pronucleus. 2. Anterior; in front of: procephalic. | | ETYMOLOGY: | Middle English, from Old French, from Greek, from pro, before, in front. See per1 in Appendix I.
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| The American Heritage® Dictionary of the English Language, Fourth Edition. Copyright © 2000 by Houghton Mifflin Company. Published by the Houghton Mifflin Company. All rights reserved. |
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