English definition of Nucleus

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Definition of nucleus

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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..

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

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

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

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

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

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

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

Endoblast :: Endoblast (n.) Entoblast; endoplast. See Nucleus,.

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

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

Gymnocytode :: Gymnocytode (n.) A cytode without either a cell wall or a nucleus.

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

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

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

Envelop :: Envelop (n.) The nebulous covering of the head or nucleus of a comet; -- called also coma.

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

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

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..

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..

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