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[proh-tuh-plast] /ˈproʊ təˌplæst/
  1. the contents of a cell within the cell membrane, considered as a fundamental entity.
  2. the primordial living unit or cell.
a person or thing that is formed first; original; prototype.
the hypothetical first individual or one of the supposed first pair of a species or the like.
Origin of protoplast
1525-35; < Late Latin prōtoplastus the first man, noun use of Greek prōtóplastos formed first. See proto-, -plast
Related forms
protoplastic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for protoplast
Historical Examples
  • For this, the simplest form of the protoplast community is a single pair.

    Opuscula Robert Gordon Latham
  • He furrowed his protoplast brow that looked as youthful as it had a century ago.

    Man Made Albert R. Teichner
  • Fortunately the time was already past when protoplast patients were looked upon as something mildly freakish and to be pitied.

    Man Made Albert R. Teichner
  • I came out of the chamber all protoplast except for the spinal zone.

    Man Made Albert R. Teichner
  • Verse cxxiv., protoplast, the original, the thing first formed.

    The Browning Cyclopdia Edward Berdoe
  • The differentiation into nucleus and cytoplasm represents a division of labour in the protoplast.

    Darwin and Modern Science A.C. Seward and Others
British Dictionary definitions for protoplast


a unit consisting of the living parts of a cell, including the protoplasm and cell membrane but not the vacuoles or (in plants) the cell wall
Derived Forms
protoplastic, adjective
Word Origin
C16: from Late Latin prōtoplastus the first-formed, from Greek prōtoplastos, from proto- + plassein to shape
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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protoplast in Medicine

protoplast pro·to·plast (prō'tə-plāst')

  1. The living material of a plant or bacterial cell, including the protoplasm and plasma membrane after the cell wall has been removed.

  2. One that is the first made or formed; a prototype.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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