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Proto-Romance
Proto-Semitic
protoceratops
protocol
protocol statement
protocontinent
protoctist
protogalaxy
protohuman
protoindustrialization
protolanguage
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protomartyr
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proton
proton number
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protoplast
pro·to·plast [ prṓtə plàst ] (plural pro·to·plasts)


noun 
Definition:
 
contents of plant cell: the living substance of a plant or bacterial cell, excluding the cell wall
[Mid-16th century. Via French and late Latin, "first created being" < Greek prōtoplastos< plastos "formed" < plassein "to form"]

pro·to·plas·tic [ prtə plástik ] adjective
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