celln.[OF. celle, fr. L. cella; akin to celare to hide, and E. hell, helm, conceal. Cf. Hall.]1. A very small and close apartment, as in a prison or in a monastery or convent; the hut of a hermit.()The heroic confessor in his cell. (Macaulay.)2. A small religious house attached to a monastery or convent.(Milman.)3. Any small cavity, or hollow place.()4. (Arch.) The space between the ribs of a vaulted roof.()5. (Elec.) A jar of vessel, or a division of a compound vessel, for holding the exciting fluid of a battery.()6. (Biol.) One of the minute elementary structures, of which the greater part of the various tissues and organs of animals and plants are composed.()()Air cell. See Air cell. -- Cell development (called also cell genesis, cell formation, and cytogenesis), the multiplication, of cells by a process of reproduction under the following common forms; segmentation or fission, gemmation or budding, karyokinesis, and endogenous multiplication. See Segmentation, Gemmation, etc. -- Cell theory. (Biol.) See Cellular theory, under Cellular.()()v. t. To place or inclose in a cell.(Warner.)n.[L.] (Arch.) The part inclosed within the walls of an ancient temple, as distinguished from the open porticoes.()