(Nu"cle*al Nu"cle*ar) a. Of or pertaining to a nucleus; as, the nuclear spindle (see Illust. of Karyokinesis) or the nuclear fibrils of a cell; the nuclear part of a comet, etc.

(Nu"cle*ate) a. [L. nucleatus having a kernel.] Having a nucleus; nucleated.

(Nu"cle*ate) v. t. [Cf. L. nucleare to become kernelly.] To gather, as about a nucleus or center.

(Nu"cle*a`ted) a. Having a nucleus; nucleate; as, nucleated cells.

(Nu*cle"i*form) a. [L. nucleus kernel + -form.] Formed like a nucleus or kernel.

(Nu"cle*in) n. (Physiol. Chem.) A constituent of the nuclei of all cells. It is a colorless amorphous substance, readily soluble in alkaline fluids and especially characterized by its comparatively large content of phosphorus. It also contains nitrogen and sulphur.

(Nu"cle*o*branch) a. (Zoöl.) Belonging to the Nucleobranchiata.n. One of the Nucleobranchiata.

(||Nu`cle*o*bran`chi*a"ta) n. pl. [NL. See Nucleus, and Branchia] (Zoöl.) See Heteropoda.

(||Nu`cle*o*id`i*o*plas"ma) n. [NL. See Nucleus, and Idioplasma.] (Biol.) Hyaline plasma contained in the nucleus of vegetable cells.

(Nu*cle"o*lar) a. (Biol.) Of or pertaining to the nucleolus of a cell.

(Nu"cle*o*la`ted) a. Having a nucleole, or second inner nucleus.

(Nu"cle*ole) n. [See Nucleolus.] The nucleus within a nucleus; nucleolus.

(Nu*cle"o*lus) n.; pl. Nucleoli [L., a little nut, dim. of nucleus.]

1. A little nucleus.

2. (Biol.) A small rounded body contained in the nucleus of a cell or a protozoan.

It was termed by Agassiz the entoblast. In the protozoa, where it may be situated on one side of the nucleus, it is sometimes called the endoplastule, and is supposed to be concerned in the male part of the reproductive process. See Nucleus.

(Nu"cle*o*plasm) n. [Nucleus + -plasm.] (Biol.) The matter composing the nucleus of a cell; the protoplasm of the nucleus; karyoplasma.

(Nu`cle*o*plas"mic) a. (Biol.) Of or pertaining to nucleoplasm; — esp. applied to a body formed in the developing ovum from the plasma of the nucleus of the germinal vesicle.

(Nu"cle*us) n.; pl. E. Nucleuses L. Nuclei [L., a kernel, dim. fr. nux, nucis, nut. Cf. Newel post.]

1. 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.

It must contain within itself a nucleus of truth.
I. Taylor.

2. (Astron.) The body or the head of a comet.

3. (Bot.) (a) An incipient ovule of soft cellular tissue. (b) A whole seed, as contained within the seed coats.

  By PanEris using Melati.

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