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..

Karyoplasma :: Karyoplasma (n.) The protoplasmic substance of the nucleus of a cell: nucleoplasm; -- in opposition to kytoplasma, the protoplasm of the cell..

Janizary :: "Janizary (n.) A soldier of a privileged military class, which formed the nucleus of the Turkish infantry, but was suppressed in 1826..

Met- :: Met- () That two replacing radicals, in the benzene nucleus, occupy the relative positions of 1 and 3, 2 and 4, 3 and 5, 4 and 6, 5 and 1, or 6 and 2; as, metacresol, etc. See Ortho-, and Para-..

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

Center :: Center (n.) A principal or important point of concentration; the nucleus around which things are gathered or to which they tend; an object of attention, action, or force; as, a center of attaction..

Phosphoryl :: Phosphoryl (n.) The radical PO, regarded as the typical nucleus of certain compounds..

Centrosome :: Centrosome (n.) A peculiar rounded body lying near the nucleus of a cell. It is regarded as the dynamic element by means of which the machinery of cell division is organized.

Endoblast :: Endoblast (n.) Entoblast; endoplast. See Nucleus,.

Chromosome :: Chromosome (n.) One of the minute bodies into which the chromatin of the nucleus is resolved during mitotic cell division; the idant of Weismann.

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

Spermococcus :: Spermococcus (n.) The nucleus of the sperm cell.

Pronucleus :: Pronucleus (n.) One of the two bodies or nuclei (called male and female pronuclei) which unite to form the first segmentation nucleus of an impregnated ovum.

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

Kernel :: Kernel (n.) A small mass around which other matter is concreted; a nucleus; a concretion or hard lump in the flesh.

Ovule :: Ovule (n.) The rudiment of a seed. It grows from a placenta, and consists of a soft nucleus within two delicate coatings. The attached base of the ovule is the hilum, the coatings are united with the nucleus at the chalaza, and their minute orifice is the foramen..

Endoplast :: Endoplast (n.) See Nucleus.

Nucleated :: Nucleated (a.) Having a nucleus; nucleate; as, nucleated cells..

Sulphophosphate :: Sulphonium (n.) A hypothetical radical, SH3, regarded as the type and nucleus of the sulphines..

Mesoplast :: Mesoplast (n.) The nucleus of a cell; mesoblast.