tussock moth
a member of the family Lymantriidae (Lepidoptera) whose larvae are serious defoliators of forest trees, e.g., the Douglas-fir tussock moth (Orgyia pseudotsugata) and the gypsy moth (Lymantria dispar) —note tussock moths are named for the tufts (horns) of long hairs on the larva's thorax and abdomen —see tussockosisThis definition last updated 10/10/2008