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proton
proton number
proton pump
proton pump inhibitor
proton synchrotron
protonema
protonics
protonotary
protoplanet
protoplasm
protoplast
protoporphyrin
protostar
protostome
prototherian
prototrophic
prototype
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protoplanet
pro·to·plan·et [ prṓtə plànnət ] (plural pro·to·plan·ets)


noun 
Definition:
 
hypothetical source of planet: a theoretical mass of gas in the clouds of gas and dust around a star that is believed to develop into a planet

pro·to·plan·e·tar·y [ prtə plánnə tèrree ] adjective
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