Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The semipermeable membrane that encloses the cytoplasm of a cell.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun cytology The semipermeable membrane that surrounds the cytoplasm of a cell.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a thin membrane (a double layer of lipids) enclosing the cytoplasm of a cell; proteins in the membrane control passage of ions (like sodium or potassium or calcium) in and out of the cell

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