Lewis & Short

sellĭsternĭa, ōrum, n. [sella-sterno; cf. lectisternium], religious banquets offered to female deities (because, at table, the women sat upon sellae, while the men reclined upon lecti, whence lectisternium), Tac. A. 15, 44; Fest. s. v. solla, pp. 298 and 299 Müll.; Serv. Verg. A. 8, 176; cf.: Juno et Minerva in sellas ad cenam invitantur, Val. Max. 2, 1, 2: sellisternium = σελλάστρωσις, Gloss. Cyrill.