Nucleus :: Nucleus (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..

Nucleus :: Nucleus (n.) The body or the head of a comet.

Nucleus :: Nucleus (n.) An incipient ovule of soft cellular tissue.

Nucleus :: Nucleus (n.) A whole seed, as contained within the seed coats..

Nucleus :: Nucleus (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..

Nucleus :: Nucleus (n.) The tip, or earliest part, of a univalve or bivalve shell..

Nucleus :: Nucleus (n.) The central part around which additional growths are added, as of an operculum..

Nucleus :: Nucleus (n.) A visceral mass, containing the stomach and other organs, in Tunicata and some mollusks..

Nucleuses :: Nucleuses (pl. ) of Nucleu.

Paranucleus :: Paranucleus (n.) Some as Nucleolus.

Pronucleus :: Pronucleus (n.) One of the two bodies or nuclei (called male and female pronuclei) which unite to form the first segmentation nucleus of an impregnated ovum.

Trinucleus :: Trinucleus (n.) A genus of Lower Silurian trilobites in which the glabella and cheeks form three rounded elevations on the head.

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