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from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The semipermeable membrane that encloses the cytoplasm of a cell. Also called cytomembrane, plasmalemma, plasma membrane.

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

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

  • n. 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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