nucleus

1. n. A kernel; hence, a central mass or point about which matter is gathered, or to which accretion is made; the central or material portion; -- used both literally and figuratively. Source: opted

2. n. The body or the head of a comet. Source: opted

3. n. An incipient ovule of soft cellular tissue. Source: opted

4. n. A whole seed, as contained within the seed coats. Source: opted

5. n. A body, usually spheroidal, in a cell or a protozoan, distinguished from the surrounding protoplasm by a difference in refrangibility and in behavior towards chemical reagents. It is more or less protoplasmic, and consists of a clear fluid (achromatin) through which extends a network of fibers (chromatin) in which may be suspended a second rounded body, the nucleolus (see Nucleoplasm). See Cell division, under Division. Source: opted

6. n. The tip, or earliest part, of a univalve or bivalve shell. Source: opted

7. n. The central part around which additional growths are added, as of an operculum. Source: opted

8. n. A visceral mass, containing the stomach and other organs, in Tunicata and some mollusks. Source: opted

9. n. a part of the cell containing DNA and RNA and responsible for growth and reproduction Source: wordnet

10. n. the positively charged dense center of an atom Source: wordnet

11. n. a small group of indispensable persons or things Source: wordnet

12. n. (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 Source: wordnet

Thesaurus links