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proton pump
proton pump inhibitor
proton synchrotron
protonema
protonics
protonotary
protoplanet
protoplasm
protoplast
protoporphyrin
protostar
protostome
prototherian
prototrophic
prototype
protoxide
protozoan
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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
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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