a basic tenet of modern biology, first stated by Matthias Schleiden and Theodor Schwann in 1838–39, that cells are the basic units of structure and function in living organisms.
Historical Examples


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  • Cell-wall

    the definite boundary or wall that is part of the outer structure of certain cells, as a plant cell. Historical Examples noun the outer layer of a cell, esp the structure in plant cells that consists of cellulose, lignin, etc, and gives mechanical support to the cell cell wall n. The rigid outermost cell layer […]

  • Cell yell

    noun any excessively loud talking on a cellular telephone Word Origin 1999 Usage Note informal

  • Cells

    a small room, as in a convent or prison. any of various small compartments or bounded areas forming part of a whole. a small group acting as a unit within a larger organization: a local cell of the Communist party. Biology. a usually microscopic structure containing nuclear and cytoplasmic material enclosed by a semipermeable membrane […]

  • Cell-mediated immune response

    cell-mediated immune response n. The immune response produced when sensitized T cells attack foreign antigens and secrete lymphokines that initiate the body’s humoral immune response. Also called cell-mediated reaction, cellular immune response. cell-mediated immune response An immune response produced when T cells, especially cytotoxic T cells, that are sensitized to foreign antigens attack and lyse […]

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