"spider," O.E. attorcoppa, lit. "poison-head," from ator "poison," from P.Gmc. *aitra- "poisonous ulcer" (cf. O.N. eitr, O.H.G. eitar "poison;" Ger. eiter "pus," O.H.G. eiz "abscess, boil") + copp "top, summit, round head," probably also "spider" (cf.
cobweb and Du. spinne-cop "spider").