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PRB
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pre-
pre-Columbian
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prebiological
pre·bi·o·log·i·cal [ pree b ə lójjik'l ]


adjective 
Definition:
 
before life began: relating or belonging to a time in geologic history before the appearance of living organisms
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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