Nucleus



GRE TOEFL 考研

解释

GRE 红宝书

• n. （原子）核
• ［英］ n. （原子）核 ( the central part of an atom)

Webster Collegiate

noun (plural nuclei; also nucleuses)

• Etymology: New Latin, from Latin, kernel, from nuc-, nux nut — more at nut
• Date: 1704
• 1.
  • a. the small bright body in the head of a comet
  • b. the small brighter and denser portion of a galaxy
• 2. 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 neutrons
• 3. the peak of sonority in the utterance of a syllable
• 4. a basic or essential part ; core <players who are the nucleus of the team>

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