From raphad; a railing (as spread along) -- bottom.
see HEBREW raphad
H7507. rephidah
[רְפִידָה] noun feminine perhaps support (compare Arabic above), i.e. back, or arm, of palanquin; suffix רְפִידָתוֺ Song of Solomon 3:10; ᵐ5 ἀνάκλιτον, ᵑ9 reclinatorium.