Meaning of NUCLEUS
| Pronunciation: | | 'nookleeus
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 WordNet Dictionary |
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| | Definition: | |
- [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
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| | Synonyms: | | cell nucleus, core, core group, karyon |
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| | See Also: | | achromatin, atom, cadre, cell, cell organ, center, centre, chromatin, chromosome, comet, karyoplasm, midpoint, neural structure, nucleole, nucleolus, nucleon, nucleoplasm, organelle, pronucleus, set | |
| Products Dictionary |
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| | Definition: | |  Nucleus
A team of physicists guides readers on an eye-opening journey into the structure of the natural world, probing the most important unanswered questions about matter and the nature of the nucleus. more details ... |
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| Webster's 1913 Dictionary |
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| | Definition: | | \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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| Medical Dictionary |
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| | Definition: | | Center portion of cells essential for cell growth, nourishment and reproduction. |
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| Biology Dictionary |
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| | Definition: | | The cellular organelle in eukaryotes that contains the genetic material. Diameter is usually 5 micrometers. Plural: nuclei. |
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| Glossary |
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| | Definition: | |
- The membrane-bound region of a eukaryotic cell that contains the chromosomes.
- The cellular organelle in eukaryotes that contains most of the genetic material.
- a structure found in the cell that contains the chromosomes.
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| Thesaurus Terms |
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| | Related Terms: | | 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 |
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