philtrum definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
noun pl. philtra
the vertical indentation between the upper lip and the nose
philtrum - Medical Definition
noun pl. phil·tra
The vertical indentation in the midline of the upper lip. Also called infranasal depression.