cell - (biology) the basic structural and functional unit of all organisms; cells may exist as independent units of life (as in monads) or may form colonies or tissues as in higher plants and animals

pronucleus - the nucleus of the ovum or sperm after fertilization but before they fuse to form the nucleus of the zygote

karyoplasm, nucleoplasm - the protoplasm that constitutes the nucleus of a cell

nucleole, nucleolus - a small round body of protein in a cell nucleus; nucleoli contain RNA and are involved in protein synthesis

chromatin, chromatin granule - the readily stainable substance of a cell nucleus consisting of DNA and RNA and various proteins; during mitotic division the chromatin condenses into chromosomes

achromatin - the part of a cell nucleus that is relatively uncolored by stains or dyes

linin - an obsolete term for the network of viscous material in the cell nucleus on which the chromatin granules were thought to be suspended

chromosome - a threadlike body in the cell nucleus that carries the genes in a linear order

cell organ, organelle - a specialized part of a cell; analogous to an organ; "the first organelle to be identified was the nucleus"

subthalamic nucleus - an oval mass of gray matter located in the caudal part of the subthalamus; associated with the striate body

midpoint, centre, center - a point equidistant from the ends of a line or the extremities of a figure

nucleon - a constituent (proton or neutron) of an atomic nucleus

atom - (physics and chemistry) the smallest component of an element having the chemical properties of the element

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"

cadre - a nucleus of military personnel capable of expansion

astronomy, uranology - the branch of physics that studies celestial bodies and the universe as a whole

midpoint, centre, center - a point equidistant from the ends of a line or the extremities of a figure

comet - (astronomy) a relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit

neural structure - a structure that is part of the nervous system

dentate nucleus - a large laminar nucleus of gray matter within the white matter of each cerebral hemisphere