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protoceratops
protocol
protocol statement
protocontinent
protoctist
protogalaxy
protohuman
protoindustrialization
protolanguage
protolithic
protomartyr
protomorphic
proton
proton number
proton pump
proton pump inhibitor
proton synchrotron
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protostar
pro·to·star [ prṓtə str ] (plural pro·to·stars)


noun 
Definition:
 
gas and dust that forms star: an interstellar cloud of gas and dust thought to develop into a star when it has collapsed sufficiently for nuclear reactions to begin
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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