Category: U

Long thin lamina of bone from the orbital plate of the ethmoid articulating with the inferior turbinate.  

Twin pregnancy with one embryo in the uterus and the other in the abdominal cavity.  

The position in which the patient lies on the right side is used in acute pleurisy, lobar pneumonia of the right side, and in a greatly enlarged liver; the position in which the patient lies on left side is used in lobar pneumonia, pleurisy on the left side, and in large pericardial effusions.  

Melanin in the choroid layer of the eye, the ciliary processes, and the posterior surface of the iris. Uveal pigment absorbs light within the eyeball to prevent glare.  

Pericarditis associated with end-stage renal failure or hemodialysis. It indicates the need for more frequent or more intensive dialysis.  

The small projection in the vestibule of the female perineum at the entrance of the urethra.  

The amount of urine produced by the kidneys.  

The opening of the ureter into the bladder.  

The notch on the distal end of the radius that receives the head of the ulna.  

An aerosol produced by the action of a vibrating ultrasonic transducer under water.