reentrant angle 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.
in a polygon, an interior angle greater than 180°, with its point turning back into the figure rather than out from it
reentrant angle definition by American Heritage Dictionary
also re-entrant anglenoun
In an irregular polygon, an interior angle that is greater than 180° and whose apex faces into the polygon.
CBA is a reentrant angle