Lewis & Short

lectisternĭum, ĭi, n. [2. lectus-sterno], a feast of the gods.

  1. I. Lit., an offering in which the images of the gods, lying on pillows, were placed in the streets, and food of all kinds set before them; these banquets were prepared by the Epulones, and consumed by them, Liv. 5, 13, 6; 7, 2, 27; 8, 25; 21, 62; 22, 1; 10 et saep.; cf.: lecti sternebantur in honorem deorum, unde hoc sacrum, vel potius sacrilegium nomen accepit, Aug. C. D. 3, 17, 2; cf. also Paul. ex Fest. p. 351 Müll.
  2. II. Transf., in the Christian age, a feast held in memory of a deceased person, or at the consecration of a chapel dedicated to him, a feast of the dead, Sid. Ep. 4, 15; Inscr. Grut. 753, 4.