Upwell, up-wel′, v.i. to upspring.

Upwhirl, up-hwėrl′, v.i. to whirl upward.—v.t. to raise upward in a whirling course.

Upwind, up-wīnd′, v.t. (Spens.) to wind up:—pa.t. upwound′.

Upwreathe, up-rēth′, v.i. to rise with a wreathing or curling motion.

Upwrought, up-rawt′, p.adj. wrought upward.

Ur, er, interj. a meaningless utterance between the words of hesitating speakers.

Urachus, ū′ra-kus, n. one of the ligaments of the bladder formed by the remaining constricted portion of the allantois of the fœtus. [Gr. ourachosouron, urine.]

Uræmia, ū-rē′mi-a, n. a morbid condition of the blood due to the retention of urea or other waste materials ordinarily excreted from the body by the kidneys—also Urē′mia.—adjs. Uræ′mic, Urē′mic, relating to the peculiar symptoms associated with defective excretion of waste products by the kidneys.

Uræum, ū-rē′um, n. the posterior half of a bird—opp. to Stethiæum:—pl. Uræ′a. [Gr. oura, a tail.]

Uræus, ū-rē′us, n. the serpent emblem of ancient Egyptian divinities and kings, placed on the headdress. [Gr. ouraios, of the tail.]