English definition of Nucleus

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Definition of nucleus

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Nucleus (n.) 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..

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Para- :: Para- () A prefix denoting: (a) Likeness, similarity, or connection, or that the substance resembles, but is distinct from, that to the name of which it is prefixed; as paraldehyde, paraconine, etc.; also, an isomeric modification. (b) Specifically: (Organ. Chem.) That two groups or radicals substituted in the benzene nucleus are opposite, or in the respective positions 1 and 4; 2 and 5; or 3 and 6, as paraxylene; paroxybenzoic acid. Cf. Ortho-, and Meta-. Also used adjectively..

Indogen :: Indogen (n.) A complex, nitrogenous radical, C8H5NO, regarded as the essential nucleus of indigo..

Nucleolus :: Nucleolus (n.) A small rounded body contained in the nucleus of a cell or a protozoan.

Bond :: Bond (n.) A unit of chemical attraction; as, oxygen has two bonds of affinity. It is often represented in graphic formulae by a short line or dash. See Diagram of Benzene nucleus, and Valence..

Nucleolus :: Nucleolus (n.) A little nucleus.

Carinaria :: Carinaria (n.) A genus of oceanic heteropod Mollusca, having a thin, glassy, bonnet-shaped shell, which covers only the nucleus and gills..

Endoplast :: Endoplast (n.) See Nucleus.

Cytococcus :: Cytococcus (n.) The nucleus of the cytula or parent cell.

Nucleoidioplasma :: Nucleoidioplasma (n.) Hyaline plasma contained in the nucleus of vegetable cells.

Thiophthene :: Thiophthene (n.) A double thiophene nucleus, C6H4S2, analogous to thionaphthene, and the base of a large series of compounds..

Nucellus :: Nucellus (n.) See Nucleus, 3 (a)..

Pyrrol :: Pyrrol (n.) A nitrogenous base found in coal tar, bone oil, and other distillates of organic substances, and also produced synthetically as a colorless liquid, C4H5N, having on odor like that of chloroform. It is the nucleus and origin of a large number of derivatives. So called because it colors a splinter of wood moistened with hydrochloric acid a deep red..

Periblast :: Periblast (a.) The protoplasmic matter which surrounds the entoblast, or cell nucleus, and undergoes segmentation..

Plastin :: Plastin (n.) A substance associated with nuclein in cell nuclei, and by some considered as the fundamental substance of the nucleus..

Karyostenosis :: Karyostenosis (n.) Direct cell division (in which there is first a simple division of the nucleus, without any changes in its structure, followed by division of the protoplasm of the karyostenotic mode of nuclear division..

Multispiral :: Multispiral (a.) Having numerous spiral coils round a center or nucleus; -- said of the opercula of certain shells.

Nucleolated :: Nucleolated (a.) Having a nucleole, or second inner nucleus..

Blastide :: Blastide (n.) A small, clear space in the segments of the ovum, the precursor of the nucleus..

Thionaphthene :: Thionaphthene (n.) A double benzene and thiophene nucleus, C8H6S, analogous to naphthalene, and like it the base of a large series of derivatives..

Nucleole :: Nucleole (n.) The nucleus within a nucleus; nucleolus.