WordNet (r) 3.0 (2006):

Malacosoma disstria
    n 1: larvae of a gregarious North American moth that spins a web
         resembling a carpet rather than a tent; serious defoliator
         of deciduous trees [syn: forest tent caterpillar,
         Malacosoma disstria]
    2: moth whose gregarious larvae spin webs resembling carpets
       [syn: tent-caterpillar moth, Malacosoma disstria]