Definitions for the word "nucleus" from multiple English dictionaries.
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: The 1913 Webster Unabridged Dictionary, 1913
2. n.
The body or the head of a comet.
Source: The 1913 Webster Unabridged Dictionary, 1913
3. n.
An incipient ovule of soft cellular tissue.
Source: The 1913 Webster Unabridged Dictionary, 1913
4. n.
A whole seed, as contained within the seed coats.
Source: The 1913 Webster Unabridged Dictionary, 1913
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: The 1913 Webster Unabridged Dictionary, 1913
6. n.
The tip, or earliest part, of a univalve or bivalve shell.
Source: The 1913 Webster Unabridged Dictionary, 1913
7. n.
The central part around which additional growths are added, as of an operculum.
Source: The 1913 Webster Unabridged Dictionary, 1913
8. n.
A visceral mass, containing the stomach and other organs, in Tunicata and some mollusks.
Source: The 1913 Webster Unabridged Dictionary, 1913
9. n.
(pl. Nuclei) 1 a central part or thing round which others are collected. B kernel of an aggregate or mass. 2 initial part meant to receive additions. 3 central core of an atom. 4 large dense part of a cell, containing the genetic material. [latin, = kernel, diminutive of nux nuc- nut]
Source: Oxford English Dictionary, 1884
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