Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
a red or purplish birthmark consisting of dense webs of dilated blood vessels near the surface of the skin
often called port-wine mark
Used by arrangement with John Wiley & Sons, Inc.
port-wine stain - Medical Definition
The American Heritage® Medical Dictionary Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A purplish area of the skin, usually on the head and neck, appearing at birth and caused by an overgrowth of the cutaneous capillaries. Also called nevus flammeus, port-wine mark.