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protonema
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protoplanet
protoplasm
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protolithic
pro·to·lith·ic [ prtə líthik ]


adjective 
Definition:
 
of early Stone Age: relating to the earliest part of the Stone Age
[Late 19th century. After Neolithic]
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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