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protoplasm
protoplast
protoporphyrin
protostar
protostome
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proton number
pro·ton num·ber (plural pro·ton num·bers)


noun 
Definition:
 
physics 
Same as  atomic number
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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