bin

bottom, floor, under, below, ground, underneath, base

From Avestan būna- "bottom".

Ultimately from PIE root *bhudhno- "bottom",
Sanskrit budhnah,
Greek pythmen "foundation",
Proto-Germanic *buthm-,
Latin fundus "bottom, piece of land, farm",
Old Irish bond "sole of the foot",
Old High German bodam,
German Boden "ground, earth, soil",
Old Frisian boden "soil",
Old Norse botn,
Dutch bodem,
Old English botm, bodan "ground, soil, foundation, lowest or deepest part of anything",
Middle English botme.

binyad, binî