(Let"u*a*ry) n. Electuary. [Obs.] Chaucer.

(Let"-up`) n. [See Let to forbear.] Abatement; also, cessation; as, it blew a gale for three days without any let-up. [Colloq.]

(Leuc-) Same as Leuco-.

(||Leu`ca*den"dron) n. [NL., fr. Gr. leyko`s white + de`ndron tree.] (Bot.) A genus of evergreen shrubs from the Cape of Good Hope, having handsome foliage. Leucadendron argenteum is the silverboom of the colonists.

(Leu*can"i*line) (lu*kan"i*lin or -len), n. [Leuc- + aniline.] (Chem.) A colorless, crystalline, organic base, obtained from rosaniline by reduction, and also from other sources. It forms colorless salts.

(||Leu*chæ"mi*a) n. [NL., fr. Gr. leyko`s white + a"i^ma blood.] (Med.) See Leucocythæmia.Leu*chæm"ic a. [Written also leukæmia, leukæmic.]

(Leu"cic Leu*cin"ic) a. (Chem.) Pertaining to, or designating, an acid obtained from leucin, and called also oxycaproic acid.

(Leu"cin) n. [Gr. leyko`s white.] (Physiol. Chem.) A white, crystalline, nitrogenous substance formed in the decomposition of albuminous matter by pancreatic digestion, by the action of boiling dilute sulphuric acid, and by putrefaction. It is also found as a constituent of various tissues and organs, as the spleen, pancreas, etc., and likewise in the vegetable kingdom. Chemically it is to be considered as amido-caproic acid.

(Leu"cite) n. [Gr. leyko`s white: cf. F. leucite.]

1. (Min.) A mineral having a glassy fracture, occurring in translucent trapezohedral crystals. It is a silicate of alumina and potash. It is found in the volcanic rocks of Italy, especially at Vesuvius.

2. (Bot.) A leucoplast.

(Leu*cit"ic) a. (Min.) Containing leucite; as, leucitic rocks.

(Leu"ci*toid) n. [Leucite + -oid.] (Crystallog.) The trapezohedron or tetragonal trisoctahedron; — so called as being the form of the mineral leucite.

(Leu"co- Leuc-) (luk- ). leyko`s white.]—> A combining form signifying white, colorless; specif. (Chem.), denoting an extensive series of colorless organic compounds, obtained by reduction from certain other colored compounds; as, leucaniline, leucaurin, etc.

(Leu"co*cyte) n. [Leuco- + Gr. ky`tos a hollow vessel.] (Physiol.) A colorless corpuscle, as one of the white blood corpuscles, or those found in lymph, marrow of bone, connective tissue, etc.

They all consist of more or less spherical masses of protoplasm, without any surrounding membrane or wall, and are capable of motion.

(||Leu`co*cy*thæ"mi*a) Leucocythemia
(||Leu`co*cy*the"mi*a) n. [NL., fr. Gr. leyko`s white + ky`tos a hollow vessel + a"i^ma blood.] (Med.) A disease in which the white corpuscles of the blood are largely increased in number, and there is enlargement of the spleen, or the lymphatic glands; leuchæmia.

(Leu`co*cy`to*gen"e*sis) (- si`to*jen"e*sis), n. [Leucocyte + genesis.] (Physiol.) The formation of leucocytes.

  By PanEris using Melati.

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