\Tus"sock\, n. [From {Tuz}.] [Written also {tussuck}.]
1. A tuft, as of grass, twigs, hair, or the like; especially,
   a dense tuft or bunch of grass or sedge.
         Such laying of the hair in tussocks and tufts.
                                               --Latimer.
2. (Bot.) Same as {Tussock grass}, below.
3. (Zo["o]l.) A caterpillar of any one of numerous species of
   bombycid moths. The body of these caterpillars is covered
   with hairs which form long tufts or brushes. Some species
   are very injurious to shade and fruit trees. Called also
   {tussock caterpillar}. See {Orgyia}.
{Tussock grass}. (Bot.)
   (a) A tall, strong grass of the genus {Dactylis} ({D.
       c[ae]spitosa}), valuable for fodder, introduced into
       Scotland from the Falkland Islands.
   (b) A tufted grass ({Aira c[ae]spitosa}).
   (c) Any kind of sedge ({Carex}) which forms dense tufts in
       a wet meadow or boggy place.
{Tussock moth} (Zo["o]l.), the imago of any tussock
   caterpillar. They belong to {Orgyia}, {Halecidota}, and
   allied genera.