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nucleus

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Merriam-Webster's Collegiate Dictionarynu·cle·us \ˈnü-klē-əs, ˈnyü-\ noun (plural nu·clei \-klē-ˌī \ ; also nu·cle·us·es) ETYMOLOGY New Latin, from Latin, kernel, from nuc-, nux nut — more at nut DATE 17041. a. the small bright body in the head of a comet b. the small brighter and denser portion of a galaxy2. a central point, group, or mass about which gathering, concentration, or accretion takes place: as a. 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 — see cell illustration b. a mass of gray matter or group of cell bodies of neurons in the central nervous system c. a characteristic and stable complex of atoms or groups in a molecule; especially : ring the naphthalene nucleus d. the positively charged central portion of an atom that comprises nearly all of the atomic mass and that consists of protons and usually neutrons3. the peak of sonority in the utterance of a syllable4. a basic or essential part : core players who are the nucleus of the teamEnglish Etymologynucleus 1704, "kernel of a nut," 1708, "head of a comet," from L. nucleus"kernel," from nucula "little nut," dim. of nux (gen. nucis) "nut," from PIE *knu(k) "lump" (cf. M.Ir. cnu, Welsh cneuen, M.Bret. knoen "nut," O.N. hnot, O.E. hnutu "nut"). General sense of "central part or thing, about which others cluster" is from 1762. Use in reference to cells first recorded 1831. Modern atomic meaning is 1912, first by Ernest Rutherford, though theoretical use for "central point of an atom" is from 1844, in Faraday.Oxford Advanced Learner's Dictionary-牛津双解-OALD7nucleusnu·cleus / 5nju:kliEs; NAmE 5nu:- / noun(pl. nu·clei / -kliai / )1. (physics 物) the part of an atom that contains most of its mass and that carries a positive electric charge 核；原子核⇨ see also neutron , proton 2. (biology 生) the central part of some cells, containing the genetic material 细胞核3. the central part of sth around which other parts are located or collected 核心；中心: These paintings will form the nucleus of a new collection. 这些画将构成新的收藏系列的基础。 OLTnucleus noun⇨ pointWebster's Third New International Dictionary, UnabridgedSearch result show the entry is found in: lenticular nucleus , or nucleus dorsalis , or nucleus of pander , or nucleus pulposus , or polar nucleus , or primary endosperm nucleus , or pulpy nucleus , or red nucleus , or relay nucleus , or resting nucleus , or restitution nucleus , or roof nucleus , or bechterew's nucleus , or secondary nucleus , or sperm nucleus , or tube nucleus , or vestibular nucleus, or yolk nucleus , or arcuate nucleus , or paraventricular nucleus , or suprachiasmatic nucleus , or nucleus habenulae , or caudate nucleus , or cleavage nucleus , or cochlear nucleus , or compound nucleus , or condensation nucleus , or deiters' nucleus , or dentate nucleus , or egg nucleus , or endosperm nucleus , or amygdaloid nucleus , or fusion nucleus , or accessory nucleus , or generative nucleus , or germ nucleusnu·cle·us\ˈn(y)üklēəs\ noun(plural nu·clei \-ēˌī\ ; also nucleuses)Etymology: New Latin, from Latin, kernel, diminutive of nuc-, nux nut — more at nut1. a. : the relatively small, brighter, and denser portion of a galaxy, of the head of a comet, or of another celestial body b. : the hot faint central star of a planetary nebula2. : a central point, part, group, or mass about which gathering, concentration, or accretion takes place : a center for subsequent increase or growth < the nucleus of masters and students that should grow into a university — H.O.Taylor > < a nucleus of fact beneath the incrustation of fable over famous names — Edward Clodd > < enough patients … to form the nucleus of a new practice — O.S.J.Gogarty > < not primarily boarding schools but rather day schools with a nucleus of boarders — J.B.Conant > < frontiers of pioneer settlement have appeared around the margins of the original nucleuses — P.E.James >as a. : an element of the protoplasm of most plant and animal cells that is regarded as an essential agent in their metabolism, growth, and reproduction and in the transmission of hereditary characters and that typically consists of a more or less rounded mass of nucleoplasm made up of a hyaline ground substance in which is suspended a network rich in nucleoproteins from which the mitotic chromosomes and one or more nucleoli condense, the whole being enclosed by a nuclear membrane — see macronucleus, micronucleus; compare coenocyte, energid, protoplast; karyolymph, linin; meiosis, mitosis; see cell illustration b. : the earliest formed part of a shell, operculum, or other similar structure c. : a visceral mass containing the stomach and other organs of some tunicates d. : madreporite e. : focus 8 f. : the hilum of a starch granule g. : core 1 k h. : a mass of gray matter or group of nerve cells in the central nervous system i. : a small mass of bees and combs of brood used in forming a new colony or in rearing queens j. : a characteristic and stable complex of atoms or groups in a molecule; especially : a ring system : ring < the naphthalene nucleus > — compare benzene ring k. : a particle on which metal forms and grows (as in solidification, condensation, recrystallization, or transformation from one solid crystalline form to another) l. : a particle upon which water vapor condenses in free air — called also kern m. : the positively charged central portion of an atom that comprises nearly all of the atomic mass and that consists of protons and neutrons except in hydrogen in which it consists of one proton only — see atomic number, mass number n. (1) : the peak of energy in the utterance of a syllable (2) : the syllable that is the seat of maximum stress in a stress group o. : head 25Synonyms: see center

Nucleus Or A The Mass Central Of Part