Lewis & Short

vescus, a, um, adj. [contr. from veesca].

  1. I. Small, little, thin, weak, feeble: farra (opp. vegrandia), Ov. F. 3, 445: papaver, Verg. G. 4, 131: frondes, id. ib. 3, 175 Serv.: corpus, Plin. 7, 20, 19, § 81: vires, Afran. ap. Non. p. 187, 3.
  2. II. Poor, wretched: fastidiosum ac vescum vivere, Lucil. ap. Non. p. 186, 32.
  3. III. Act., corroding, eating away: sal, Lucr. 1, 326 Munro ad loc.