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Cell developmentCell Cell, n. [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. ``Cells or dependent priories.' --Milman.
3. Any small cavity, or hollow place.
4. (Arch.)
(a) The space between the ribs of a vaulted roof.
(b) Same as Cella.
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.
Note: All cells have their origin in the primary cell from
which the organism was developed. In the lowest animal
and vegetable forms, one single cell constitutes the
complete individual, such being called unicelluter
orgamisms. A typical cell is composed of a semifluid
mass of protoplasm, more or less granular, generally
containing in its center a nucleus which in turn
frequently contains one or more nucleoli, the whole
being surrounded by a thin membrane, the cell wall. In
some cells, as in those of blood, in the am[oe]ba, and
in embryonic cells (both vegetable and animal), there
is no restricting cell wall, while in some of the
unicelluliar organisms the nucleus is wholly wanting.
See Illust. of Bipolar.
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. Developmental
Developmental De*vel`op*men"tal, a.
Pertaining to, or characteristic of, the process of
development; as, the developmental power of a germ.
--Carpenter.
Multicental developmentMulticentral Mul`ti*cen"tral, a. [Multi- + central.]
Having many, or several, centers; as, a multicentral cell.
Multicental development (Biol.), growth, or development,
from several centers. According as the insubordination to
a single center is more or less pronounced, the resultant
organism will be more or less irregular in form and may
even discontinuous. Nondevelopment
Nondevelopment Non`de*vel"op*ment, n.
Failure or lack of development.
RedevelopmentRedevelop Re`de*vel"op, v. t. & i.
To develop again; specif. (Photog.), to intensify (a
developed image), as by bleaching with mercuric chloride and
subsequently subjecting anew to a developing agent. --
Re`de*vel"op*er, n. -- Re`de*vel"op*ment, n. Unicentral developmentUnicentral U`ni*cen"tral, a. [Uni- + central.] (Biol.)
Having a single center of growth.
Unicentral development, that form of development which
takes place primarily around a single central point, as in
the lowest of unicellular organisms.
