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protogalaxy
protohuman
protoindustrialization
protolanguage
protolithic
protomartyr
protomorphic
proton
proton number
proton pump
proton pump inhibitor
proton synchrotron
protonema
protonics
protonotary
protoplanet
protoplasm
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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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