Urethroscopy :: Urethroscopy (n.) Examination of the urethra by means of the urethroscope.
Urethrotome :: Urethrotome (n.) An instrument for cutting a urethral stricture.
Urethrotomy :: Urethrotomy (n.) An incision of the urethra, esp. incision for relief of urethral stricture..
Uroerythrin :: Uroerythrin (n.) A reddish urinary pigment, considered as the substance which gives to the urine of rheumatism its characteristic color. It also causes the red color often seen in deposits of urates..
Water Thrush :: Water thrush () A North American bird of the genus Seiurus, belonging to the Warbler family, especially the common species (S. Noveboracensis)..
Whitethroat :: Whitethroat (n.) Any one of several species of Old World warblers, esp. the common European species (Sylvia cinerea), called also strawsmear, nettlebird, muff, and whitecap, the garden whitethroat, or golden warbler (S. hortensis), and the lesser whitethroat (S. curruca)..
Xylanthrax :: Xylanthrax (n.) Wood coal, or charcoal; -- so called in distinction from mineral coal..
Yellowthroat :: Yellowthroat (n.) Any one of several species of American ground warblers of the genus Geothlypis, esp. the Maryland yellowthroat (G. trichas), which is a very common species..