Medical Definition of superior vena cava syndrome
: a condition characterized by elevated venous pressure of the upper extremities with accompanying distension of the affected veins and swelling of the face and neck and caused by blockage (as by a thrombus or an aneurysm) or compression (as by a tumor) of the superior vena cava
Love words? Need even more definitions?Merriam-Webster unabridged
Words at Play
Ask the Editors
Commonly Confused Words Quiz
Take a (break/brake) and (pore/pour) over this (c...
Words Named After People
Find out who’s behind "leotard," "morphine," an...
How Strong Is Your Vocabulary?
Test your vocabulary with our 10-question quiz!
Spelling Bee Quiz
Can you outdo past winners of the National Spelli...