About The Word Nucleus
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Nucleus
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Nucleus Definition And Meaning |
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What's The Definition Of Nucleus?
[n] a part of the cell containing DNA and RNA and responsible for growth and reproduction
[n] any histologically identifiable mass of neural cell bodies in the brain or spinal cord [n] a small group of indispensable persons or things; "five periodicals make up the core of their publishing program" [n] the positively charged dense center of an atom [n] (astronomy) the center of the head of a comet; consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to form the coma and tail Synonyms | Synonyms for Nucleus: cell nucleus | core | core group | karyon Related Terms | Find terms related to Nucleus: alpha particle | Anlage | antibaryon | antilepton | antimeson | atomic nucleus | atomic particle | axiom | axis | baryon | basichromatin | beta particle | bud | center | center of action | center of gravity | centroid | centrum | chromatin | chromatin strands | core | dead center | diameter | diaphragm | egg | electron | elementary particle | elixir | embryo | epicenter | equator | essence | essential | flower | focus | fundamental | germ | germen | gist | gravamen | heart | heterochromatin | hub | hypostasis | inner essence | interior | karyosome | karyotin | Kern | kernel | lepton | loins | macronucleus | marrow | mean | meat | median | medulla | meganucleus | meson | metacenter | micronucleus | middle | midmost | midriff | midst | nave | navel | neutron | NMR | nub | nuclear force | nuclear magnetic resonance | nuclear particle | nuclear resonance | nucleolus | nucleon | nucleosynthesis | nuts and bolts | omphalos | ovum | photon | pith | pivot | plasmosome | postulate | principle | proton | quid | quiddity | quintessence | rudiment | sap | seed | soul | spark | spermatozoon | spirit | storm center | strangeness | strong interaction | stuff | substance | the nitty-gritty | thick | thick of things | triton | umbilicus | valence electron | waist | waistline | zone See Also | achromatin | atom | cadre | cell | cell organ | center | centre | chromatin | chromosome | comet | karyoplasm | midpoint | neural structure | nucleole | nucleolus | nucleon | nucleoplasm | organelle | pronucleus | set Nucleus In Webster's Dictionary \Nu"cle*us\, n.; pl. E. {Nucleuses}, L. {Nuclei}. [L., a
kernel, dim. fr. nux, nucis, nut. Cf. {Newel} post.]
1. A kernel; hence, a central mass or point about which
matter is gathered, or to which accretion is made; the
central or material portion; -- used both literally and
figuratively.
It must contain within itself a nucleus of truth.
--I. Taylor.
2. (Astron.) The body or the head of a comet.
3. (Bot.)
(a) An incipient ovule of soft cellular tissue.
(b) A whole seed, as contained within the seed coats.
4. (Biol.) A body, usually spheroidal, in a cell or a
protozoan, distinguished from the surrounding protoplasm
by a difference in refrangibility and in behavior towards
chemical reagents. It is more or less protoplasmic, and
consists of a clear fluid (achromatin) through which
extends a network of fibers (chromatin) in which may be
suspended a second rounded body, the nucleolus (see
{Nucleoplasm}). See {Cell division}, under {Division}.
Note: The nucleus is sometimes termed the endoplast or
endoblast, and in the protozoa is supposed to be
concerned in the female part of the reproductive
process. See {Karyokinesis}.
5. (Zo["o]l.)
(a) The tip, or earliest part, of a univalve or bivalve
shell.
(b) The central part around which additional growths are
added, as of an operculum.
(c) A visceral mass, containing the stomach and other
organs, in Tunicata and some mollusks.
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