ὑπόβαθρον
ὑπόβαθ-ρον, τό,
A). anything put under, a base:
2). a wooden framework to support a couch, a kind of rocking apparatus, Mem. 2.1.30 , ap. 6.23.3 , ap. 4.31.84 .
3). keel of a ship, prob. for ὑποβάραθρον in 19.169 .
4). step, δἰ ὑποβάθρων Mag. 2.11 , 3.41 .