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

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

Perinuclear :: Perinuclear (a.) Of or pertaining to a nucleus; situated around a nucleus; as, the perinuclear protoplasm..

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..

Nucleiform :: Nucleiform (a.) Formed like a nucleus or kernel.

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

Pyridine :: Pyridine (n.) A nitrogenous base, C5H5N, obtained from the distillation of bone oil or coal tar, and by the decomposition of certain alkaloids, as a colorless liquid with a peculiar pungent odor. It is the nucleus of a large number of organic substances, among which several vegetable alkaloids, as nicotine and certain of the ptomaines, may be mentioned. See Lutidine..

Chalaza :: Chalaza (n.) The place on an ovule, or seed, where its outer coats cohere with each other and the nucleus..

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

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..

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..

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..

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..

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

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

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..

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

Intranuclear :: Intranuclear (a.) Within the nucleus of a cell; as. the intranuclear network of fibrils, seen in the first stages of karyokinesis..

Nuclear :: Nuclear (a.) Of or pertaining to a nucleus; as, the nuclear spindle (see Illust. of Karyokinesis) or the nuclear fibrils of a cell; the nuclear part of a comet, etc..

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