| nucleus | | |
| n. | 1. cell nucleus, karyon, nucleus | a part of the cell containing DNA and RNA and responsible for growth and reproduction. |
| ~ cell | (biology) the basic structural and functional unit of all organisms; they 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; such organelles 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 it 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 strand of DNA in the cell nucleus that carries the genes in a linear order.; "humans have 22 chromosome pairs plus two sex chromosomes" |
| ~ cell organ, cell organelle, 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 grey matter located in the caudal part of the subthalamus; associated with the striate body. |
| n. | 2. nucleus | the positively charged dense center of an atom. |
| ~ 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. |
| n. | 3. core, core group, nucleus | 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" |
| ~ cadre | a nucleus of military personnel capable of expansion. |
| n. | 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. |
| ~ 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. |
| n. | 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. |
| ~ dentate nucleus | a large laminar nucleus of grey matter within the white matter of each cerebral hemisphere. |
| n. | 6. lens nucleus, nucleus | the central structure of the lens that is surrounded by the cortex. |
| ~ anatomical structure, bodily structure, body structure, complex body part, structure | a particular complex anatomical part of a living thing.; "he has good bone structure" |
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