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.
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
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 […]