Part of speech: noun

A center of development; central mass, as of a comet; kernel.

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Usage examples "nucleus":

  1. In England it takes a bishop to make a city, but here the nucleus needed is a wheat elevator, red against the setting sun. - "The New North", Agnes Deans Cameron.
  2. They know many of them by heart; but I make them sit in class, and each, in turn, read one word, in order to teach them to keep the place, and when they finish a verse, I ask them to find some word, and often make it the nucleus of a group of words of the same kind, to be written upon the black- board and slates as above. - "Guide to the Kindergarten and Intermediate Class and Moral Culture of Infancy.", Elizabeth P. Peabody Mary Mann.
  3. The friar, who represents the third Conservative nucleus, is Father Martin Lafuerza. - "Cæsar or Nothing", Pío Baroja Baroja.