Lewis & Short

prōlapsĭo, ōnis, f. [prolabor].

  1. I. A slipping, falling: ingredi sine casu aut prolapsione, Cic. Cael. 17, 41.
  2. II. A falling or tumbling down: aedificiorum prolapsiones, Suet. Aug. 30.
  3. III. Trop., an error, misstep (late Lat.): intempestiva temeritas et prolapsio, Amm. 20, 4, 15; Ambros. de Noë, 14, 49; id. Bon. Mort. 10, 47.