Uropygial gland, a peculiar sebaceous gland at the base of the tail feathers in most birds. It secretes an oily fluid which is spread over the feathers by preening.

(||U`ro*pyg"i*um) n. [NL., fr. Gr. (corrupted form) the end of the os sacrum + rump.] (Anat.) The prominence at the posterior extremity of a bird's body, which supports the feathers of the tail; the rump; — sometimes called pope's nose.

(U`ro*sa"cral) a. [2d uro- + sacral.] (Anat.) Of or pertaining to both the caudal and sacral parts of the vertebral column; as, the urosacral vertebræ of birds.

(U*ros"co*py) n. [1st uro- + - scopy: cf. F. uroscopie.] The diagnosis of diseases by inspection of urine. Sir T. Browne.

(U"ro*some) n. [2d uro- + - some body.] (Zoöl.) The abdomen, or post-abdomen, of arthropods.

(U"ro*stege) n. [2d uro- + Gr. roof.] (Zoöl.) One of the plates on the under side of the tail of a serpent.

(||U*ros"te*on) n.; pl. L. Urostea E. Urosteons [NL., fr. Gr. the tail + a bone.] (Anat.) A median ossification back of the lophosteon in the sternum of some birds.

(U`ro*ster"nite) n. [2d uro- + sternum.] (Zoöl.) The sternal, or under piece, of any one of the uromeres of insects and other arthropods.

(U"ro*style) n. [2d uro- + Gr. a pillar.] (Anat.) A styliform process forming the posterior extremity of the vertebral column in some fishes and amphibians.

(U"rox) n. [See Aurochs, and cf. Urus.] (Zoöl.) The aurochs.

(U*rox"a*nate) n. (Chem.) A salt of uroxanic acid.

(U`rox*an"ic) a. [Uric + alloxan.] (Chem.) Pertaining to, or designating, an acid, C5H8N4O6, which is obtained, as a white crystalline substance, by the slow oxidation of uric acid in alkaline solution.

Urology to Useful

(U*rol"o*gy) n. [1st uro- + - logy.] (Med.) See Uronology.

(U"ro*mere) n. [2d uro- + - mere.] (Zoöl.) Any one of the abdominal segments of an arthropod.

(U`ro*nol"o*gy) n. [Gr. urine + - logy.] (Med.) That part of medicine which treats of urine. Dunglison.

(U"ro*pod) n. [2d uro- + - pod.] (Zoöl.) Any one of the abdominal appendages of a crustacean, especially one of the posterior ones, which are often larger than the rest, and different in structure, and are used chiefly in locomotion. See Illust. of Crustacea, and Stomapoda.

(U*rop"o*dal) a. (Zoöl.) Of or pertaining to a uropod.

(U`ro*po*et"ic) a. [1st uro- + Gr. to make.]

1. (Med.) Producing, or favoring the production of, urine.

2. (Zoöl.) Of, pertaining to, or designating, a system of organs which eliminate nitrogenous waste matter from the blood of certain invertebrates.

(U`ro*pyg"i*al) a. [See Uropygium.] (Anat.) Of or pertaining to the uropygium, or prominence at the base of the tail feathers, in birds.

  By PanEris using Melati.

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