Nucleus
Definition of Nucleus
Nu´cle`us | n. | 1. | | | 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. | | 2. | (Astron.) The body or the head of a comet. | | 3. | (Bot.) An incipient ovule of soft cellular tissue. | | 4. | (Biol.) A body, usually spheroidal, in a eukaryotic cell, distinguished from the surrounding protoplasm by a difference in refrangibility and in behavior towards chemical reagents, which contains the chromosomal genetic material, including the chromosomal DNA. 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. | | 5. | (Zool.) The tip, or earliest part, of a univalve or bivalve shell. |
Related Words
Anlage, Kern, NMR, alpha particle, 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, dead center, diameter, diaphragm, egg, electron, elementary particle, elixir, embryo, epicenter, equator, essence, essential, flower, fundamental, germ, germen, gist, gravamen, heterochromatin, hypostasis, inner essence, interior, karyosome, karyotin, kernel, lepton, loins, macronucleus, marrow, mean, meat, median, medulla, meganucleus, meson, metacenter, micronucleus, midmost, midriff, midst, nave, navel, neutron, 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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nuclear-powered ship
nuclear-powered submarine
Nucleate
Nucleated
nucleic acid
Nucleiform
Nuclein
Nucleobranch
Nucleobranchiata
Nucleoidioplasma
Nucleolar
Nucleolated
Nucleole
Nucleolus
nucleon
nucleon number
Nucleoplasm
Nucleoplasmic
nucleoside
nucleotide
-Nucleus-
Nucula
Nucule
Nucumentaceous
Nudation
Nuddle
Nude
Nudge
Nudibrachiate
Nudibranch
Nudibranchiata
Nudibranchiate
Nudicaul
Nudification
Nudity
nudnik
Nudum pactum
Nugacity
Nugae
Nugation
Nugatory
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