nucleus

nouns

a part of the cell containing DNA and RNA and responsible for growth and reproduction
cell nucleus, karyon, nucleus
is derived from
nucleate
the positively charged dense center of an atom
nucleus
is a part of
(physics and chemistry) the smallest component of an element having the chemical properties of the element
atom
is a type of (narrower)
a point equidistant from the ends of a line or the extremities of a figure
center, centre, midpoint
a small group of indispensable persons or things
"five periodicals make up the core of their publishing program"
core, core group, 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
nucleus
is a part of
(astronomy) a relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit
comet
domain category
the branch of physics that studies celestial bodies and the universe as a whole
astronomy, uranology
is a type of (narrower)
a point equidistant from the ends of a line or the extremities of a figure
center, centre, midpoint
any histologically identifiable mass of neural cell bodies in the brain or spinal cord
nucleus
is a type of (narrower)
a structure that is part of the nervous system
neural structure
the central structure of the lens that is surrounded by the cortex
lens nucleus, nucleus