Lewis & Short

per-longus, a, um, adj., very long.

  1. I. Lit.: via, Cic. Att. 5, 20, 8: perlongum. adverb., for a very long time, very long, Aus. Epigr. 1, 7.
  2. II. Transf., very tedious, Plaut. Trin. 3, 3, 17.
    Adv.: perlongē, a very long way off, very far: perlonge est, Ter. Eun. 3, 5, 61.