trihedral 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.
having three sides or faces: a trihedral angle
Origin: tri- plush -hedral
a figure formed by three lines, each in a different plane, that intersect at a point
trihedral definition by American Heritage Dictionary
Having or formed by three planes meeting at a point.noun