Definition of "nucleus" [nu•cle•us]

  • A central or essential part around which other parts are gathered or grouped; a core: the nucleus of a city. (noun)
  • Something regarded as a basis for future development and growth; a kernel: a few paintings that formed the nucleus of a great art collection. (noun)
  • Biology A large, membrane-bound, usually spherical protoplasmic structure within a living cell, containing the cell's hereditary material and controlling its metabolism, growth, and reproduction. (noun)
  • Botany The central kernel of a nut or seed. (noun)
  • Botany The center of a starch granule. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Use "nucleus" in a sentence
  • "The remains of the egg nucleus, after having discharged the polar cells, form the _female nucleus_ (Fig. 40, _fn_)."
  • "In my scenario, translation outside the nucleus is an added feature and normal translation and transcription in the nucleus can stillgo on during the gradual evolution of the transport system. hrun: The mainstay of darwinian evolution is a gradualistic concept and I have not observed that is replaced by goal-oritented approaches."
  • "In my scenario, translation outside the nucleus is an added feature and normal translation and transcription in the nucleus can stillgo on during the gradual evolution of the transport system."