tussock moth 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.
any of a family (Lymantriidae) of moths whose caterpillars are covered with long tufts of hair: many, as the gypsy moth, are destructive pests of certain trees
tussock moth definition by American Heritage Dictionary
Any of various dull-colored moths of the family Lymantriidae, the caterpillars of which have tufts of hair along the back and are often destructive to deciduous trees.