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WordReference Random House Unabridged Dictionary of American English © 2024pro•to•plast (prō′tə plast′),USA pronunciation n. - [Biol.]
- the contents of a cell within the cell membrane, considered as a fundamental entity.
- the primordial living unit or cell.
- Cell Biologya person or thing that is formed first;
original;
prototype. - Cell Biologythe hypothetical first individual or one of the supposed first pair of a species or the like.
- Late Latin prōtoplastus the first man, noun, nominal use of Greek prōtóplastos formed first. See proto-, -plast
- 1525–35
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