请输入您要查询的英文单词:

 

单词 nuclei
释义

WordReference Random House Unabridged Dictionary of American English © 2024
nu•cle•i  (no̅o̅klē ī′, nyo̅o̅-),USA pronunciation n. 
  1. pl. of nucleus. 
  • Latin nucleī, nominative plural of nucleus; see nucleus

Collins Concise English Dictionary © HarperCollins Publishers::
nuclei /ˈnjuːklɪˌaɪ/ n
  1. a plural of nucleus
WordReference Random House Learner's Dictionary of American English © 2024
nu•cle•us /ˈnukliəs, ˈnyu-/USA pronunciation   n. [countable], pl. -cle•i /-kliˌaɪ/USA pronunciation  -cle•us•es. 
  1. a central part about which other parts are grouped or gathered;
    core:The police managed to arrest some members of the gang, but none that make up its nucleus.
  2. Biology, Cell Biologya special, usually round mass of material in a cell that directs its growth and reproduction and contains most of the genetic material.
  3. Physicsthe central, positively charged mass within an atom, made up of neutrons and protons and making up most of the atom's mass.

WordReference Random House Unabridged Dictionary of American English © 2024
nu•cle•us  (no̅o̅klē əs, nyo̅o̅-),USA pronunciation n., pl. -cle•i (-klē ī′),USA pronunciation -cle•us•es. 
  1. a central part about which other parts are grouped or gathered;
    core:A few faithful friends formed the nucleus of the club.
  2. Biology, Cell Biologya specialized, usually spherical mass of protoplasm encased in a double membrane, and found in most living eukaryotic cells, directing their growth, metabolism, and reproduction, and functioning in the transmission of genic characters. See illus. under ameba. 
  3. Physicsthe positively charged mass within an atom, composed of neutrons and protons, and possessing most of the mass but occupying only a small fraction of the volume of the atom.
  4. Anatomya mass of nerve cells in the brain or spinal cord in which nerve fibers form connections.
  5. MeteorologyAlso called condensation nucleus. a particle upon which condensation of water vapor occurs to form water drops or ice crystals.
  6. Chemistrya fundamental arrangement of atoms, as the benzene ring, that may occur in many compounds by substitution of atoms without a change in structure.
  7. Astronomythe condensed portion of the head of a comet.
  8. Phonetics
    • the central, most prominent segment in a syllable, consisting of a vowel, diphthong, or vowellike consonant, as the a- sound in cat or the l- sound in bottled;
      peak.
    • the most prominent syllable in an utterance or stress group;
      tonic syllable.
  • Latin: kernel, syncopated variant of nuculeus, equivalent. to nucu(la) little nut (nuc-, stem of nux nut + -ula -ule) + -leus noun, nominal suffix
  • 1695–1705
    • 1.See corresponding entry in Unabridged center, kernel, heart.

Collins Concise English Dictionary © HarperCollins Publishers::
nucleus /ˈnjuːklɪəs/ n ( pl -clei / -klɪˌaɪ/, -cleuses)
  1. a central or fundamental part or thing around which others are grouped; core
  2. a centre of growth or development; basis; kernel: the nucleus of an idea
  3. (in the cells of eukaryotes) a large compartment, bounded by a double membrane, that contains the chromosomes and associated molecules and controls the characteristics and growth of the cell
  4. the central portion in the head of a comet, consisting of small solid particles of ice and frozen gases, which vaporize on approaching the sun to form the coma and tail
  5. the positively charged dense region at the centre of an atom, composed of protons and neutrons, about which electrons orbit
  6. a fundamental group of atoms in a molecule serving as the base structure for related compounds and remaining unchanged during most chemical reactions
Etymology: 18th Century: from Latin: kernel, from nux nut
随便看

 

英语词典包含188688条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。

 

Copyright © 2004-2022 Newdu.com All Rights Reserved
更新时间:2025/7/23 9:49:39