Lewis & Short

ărānĕōsus, a, um, adj. [araneum].

  1. I. Lit., full of spiders’ webs: situs, Cat. 25, 3.
  2. II. Meton., similar to cobwebs: fila, Plin. 11, 19, 21, § 65: caulis araneosus in mandendo, id. 21, 15, 51, § 87: lanugo, id. 24, 12, 66, § 108 al.