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

Indogenide :: Indogenide (n.) Any one of the derivatives of indogen, which contain that group as a nucleus..

Mesoblast :: Mesoblast (n.) The cell nucleus; mesoplast.

Diaster :: Diaster (n.) A double star; -- applied to the nucleus of a cell, when, during cell division, the loops of the nuclear network separate into two groups, preparatory to the formation of two daughter nuclei. See Karyokinesis..

Valeryl :: Valeryl (n.) The hypothetical radical C5H9O, regarded as the essential nucleus of certain valeric acid derivatives..

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

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

Nucleus :: Nucleus (n.) A visceral mass, containing the stomach and other organs, in Tunicata and some mollusks..

Nucleoplasmic :: Nucleoplasmic (a.) Of or pertaining to nucleoplasm; -- esp. applied to a body formed in the developing ovum from the plasma of the nucleus of the germinal vesicle.

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

Nucleus :: Nucleus (n.) An incipient ovule of soft cellular tissue.

Coma :: Coma (n.) The envelope of a comet; a nebulous covering, which surrounds the nucleus or body of a comet..

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..

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

Phosphonium :: Phosphonium (n.) The hypothetical radical PH4, analogous to ammonium, and regarded as the nucleus of certain derivatives of phosphine..

Cytoplasm :: Cytoplasm (n.) The substance of the body of a cell, as distinguished from the karyoplasma, or substance of the nucleus..

Nucleus :: Nucleus (n.) The tip, or earliest part, of a univalve or bivalve shell..

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

Nucleus :: Nucleus (n.) 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..

Paranucleus :: Paranucleus (n.) Some as Nucleolus.