Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun nucleus

6 senses of nucleus

Sense 1
nucleus, cell nucleus, karyon -- (a part of the cell containing DNA and RNA and responsible for growth and reproduction)
       => organelle, cell organelle, cell organ -- (a specialized part of a cell; analogous to an organ; "the first organelle to be identified was the nucleus")

Sense 2
nucleus -- (the positively charged dense center of an atom)
       => center, centre, midpoint -- (a point equidistant from the ends of a line or the extremities of a figure)

Sense 3
core, nucleus, core group -- (a small group of indispensable persons or things; "five periodicals make up the core of their publishing program")
       => set -- (a group of things of the same kind that belong together and are so used; "a set of books"; "a set of golf clubs"; "a set of teeth")

Sense 4
nucleus -- ((astronomy) the center of the head of a comet; consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to form the coma and tail)
       => center, centre, midpoint -- (a point equidistant from the ends of a line or the extremities of a figure)

Sense 5
nucleus -- (any histologically identifiable mass of neural cell bodies in the brain or spinal cord)
       => neural structure -- (a structure that is part of the nervous system)

Sense 6
lens nucleus, nucleus -- (the central structure of the lens that is surrounded by the cortex)
       => structure, anatomical structure, complex body part, bodily structure, body structure -- (a particular complex anatomical part of a living thing; "he has good bone structure")