Lewis & Short

rŭīnōsus, a, um, adj. [ruina], of buildings.

  1. I. Tumbling down, going to ruin, ruinous (rare but class.): aedes, * Cic. Off. 3, 13, 54: parietes, Sen. Ira, 3, 35 fin. (better rimosos).
  2. * II. Poet., transf., that has already fallen, ruined, in ruins: ruinosas occulit herba domos, Ov. H. 1, 56.
    Plur. subst.: rŭīnōsa, ōrum, ruins: instaurare, Vulg. Ezech. 36, 33; 33, 27.