Lewis & Short

prōcĭdŭus, a, um, adj. [1. procido].

  1. I. Fallen down, prostrate (post-Aug.): salix procidua, Plin. 16, 32, 57, § 133; Stat. Th. 3, 127; Sid. Carm. 23, 415.
  2. II. Of parts of the body, falling down or forwards, prociduous: sedes, Plin. 21, 20, 87, § 151: umbilicus, id. 20, 20, 81, § 211.