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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..

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

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.

Nucleus :: 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..

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

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

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

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

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

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.

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..

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

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..

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

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

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

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

Nonnucleated :: Nonnucleated (a.) Without a nucleus.

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

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

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