Webster dictionary was developed by Noah Webster in the beginning of 19th century. On this website, you can find definition for nucleus from the 1913 edition of Webster's Revised Unabridged Dictionary. Define nucleus using one of the most comprehensive free online dictionaries on the web.

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nucleus
Part of Speech: noun
Results: 8
1. The body or the head of a comet.
3. A whole seed, as contained within the seed coats.
4. The tip, or earliest part, of a univalve or bivalve shell.
6. A visceral mass, containing the stomach and other organs, in Tunicata and some mollusks.
8. 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.
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