Толковый словарь английского языка Oxford English Reference - nucleus
Nucleus
nucleus
n. (pl. nuclei) 1 a the central part or thing round which others are collected. b the kernel of an aggregate or mass. 2 an initial part meant to receive additions. 3 Astron. the solid part of a comet's head. 4 Physics the positively charged central core of an atom that contains most of its mass. 5 Biol. a large dense organelle of eukaryotic cells, containing the genetic material. 6 a discrete mass of grey matter in the central nervous system. Etymology: L, = kernel, inner part, dimin. of nux nucis nut
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1.
noun (plural nuclei; also ~es) see: nut Date: 1704 1. the small bright body in the head of a comet, the small brighter and denser portion of a galaxy, a central point, group, or mass about which gathering, concentration, or accretion takes place: as, a cellular organelle of eukaryotes that is essential to cell functions (as reproduction and protein synthesis), is composed of nucleoplasm and a nucleoprotein-rich network from which chromosomes and nucleoli arise, and is enclosed in a definite membrane, a mass of gray matter or group of cell bodies of neurons in the central nervous system, a characteristic and stable complex of atoms or groups in a molecule, the positively charged central portion of an atom that comprises nearly all of the atomic mass and that consists of protons and usually neutrons, the peak of sonority in the utterance of a syllable, a basic or essential part ; core ...Толковый словарь английского языка
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