'Tussock moth' definitions:

Definition of 'tussock moth'

noun

Dull-colored moth whose larvae have tufts of hair on the body and feed on the leaves of many deciduous trees [syn: lymantriid, tussock moth]

From: GCIDE

Tussock \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. [1913 Webster]
Such laying of the hair in tussocks and tufts. --Latimer. [1913 Webster]
2. (Bot.) Same as Tussock grass, below. [1913 Webster]
3. (Zool.) 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. [1913 Webster]
Tussock grass. (Bot.) (a) A tall, strong grass of the genus Dactylis (Dactylis caespitosa), valuable for fodder, introduced into Scotland from the Falkland Islands. (b) A tufted grass (Aira caespitosa). (c) Any kind of sedge (Carex) which forms dense tufts in a wet meadow or boggy place.
Tussock moth (Zool.), the imago of any tussock caterpillar. They belong to Orgyia, Halecidota, and allied genera. [1913 Webster]