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proton number
proton pump
proton pump inhibitor
proton synchrotron
protonema
protonics
protonotary
protoplanet
protoplasm
protoplast
protoporphyrin
protostar
protostome
prototherian
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prototype
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protoplasm

pro·to·plasm [ prṓtə plàzzəm ]


noun 
Definition:
 
contents of living cell: the colorless liquid or colloidal contents of a living cell, composed of proteins, fats, and other organic substances in water, and including the nucleus and cytoplasm

[Mid-19th century. < German Protoplasma "first created thing" < Greek plasma (see plasma)]

pro·to·plas·mic [ prtə plázmik ] adjective
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