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Pentamethylene :: Pentamethylene (n.) A hypothetical hydrocarbon, C5H10, metameric with the amylenes, and the nucleus of a large number of derivatives; -- so named because regarded as composed of five methylene residues. Cf. Trimethylene, and Tetramethylene..

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..

Nucleus :: Nucleus (n.) The body or the head 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..

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

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

Nucleus :: Nucleus (n.) The central part around which additional growths are added, as of an operculum..

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

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

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..

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.

Karyokinesis :: Karyokinesis (n.) The indirect division of cells in which, prior to division of the cell protoplasm, complicated changes take place in the nucleus, attended with movement of the nuclear fibrils; -- opposed to karyostenosis. The nucleus becomes enlarged and convoluted, and finally the threads are separated into two groups which ultimately become disconnected and constitute the daughter nuclei. Called also mitosis. See Cell development, under Cell..

Uninucleated :: Uninucleated (a.) Possessed of but a single nucleus; as, a uninucleated cell..

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

Enchylemma :: Enchylemma (n.) The basal substance of the cell nucleus; a hyaline or granular substance, more or less fluid during life, in which the other parts of the nucleus are imbedded..

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

Karyomiton :: Karyomiton (n.) The reticular network of fine fibers, of which the nucleus of a cell is in part composed; -- in opposition to kytomiton, or the network in the body of the cell..

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

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

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