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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..

Nucleate :: Nucleate (v. t.) To gather, as about a nucleus or center..

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

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

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..

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..

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

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..

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..

Endoplastica :: Endoplastica (n. pl.) A group of Rhizopoda having a distinct nucleus, as the am/ba..

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

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

Nucleus :: Nucleus (n.) The body or the head of a comet.

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

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

Nucleuses :: Nucleuses (pl. ) of Nucleu.

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

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

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..

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