ὑπόβαθρον
From LSJ
Τοὺς δούλους ἔταξεν ὡρισμένου νομίσματος ὁμιλεῖν ταῖς θεραπαινίσιν → He arranged for his male slaves to have sex with female slaves at a fixed price (Plutarch, Life of Cato the Elder 21.2)
English (LSJ)
τό,
A anything put under, a base: 1 footstool, Thphr.HP5.7.6, App.Pun.111, D.L.1.94; ὑ. νυμφικά IG22.1485.54. 2 a wooden framework to support a couch, a kind of rocking apparatus, X.Mem.2.1.30, Antyll. ap. Orib.6.23.3, Anon. ap. Stob.4.31.84. 3 keel of a ship, prob. for ὑποβάραθρον in Gal.19.169. 4 step, δἰ ὑποβάθρων Lyd.Mag.2.11, 3.41.