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proton
proton number
proton pump
proton pump inhibitor
proton synchrotron
protonema
protonics
protonotary
protoplanet
protoplasm
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protoctist

pro·toc·tist [ prō tóktist ] (plural pro·toc·tists)


noun 
Definition:
 
simple organism with nuclei: a single-celled or relatively simple multicellular organism that possesses nuclei and other membrane-bound cell components. Protozoa, algae, and slime molds are protoctists. Kingdom Protoctista.

[< modern Latin Protoctista, probably alteration of Protista (see protist)]
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