Probably from bayith; a palace (i.e. Large house) -- palace.
see HEBREW bayith
H1055. bithan
בִּיתָן noun [masculine] house, palace — absolute הַבִּיתָן Esther 7:7-8, (הב ׳גִּנַּת); construct בִּיתַן 1:5 (ב ׳גִּנַּת הַמֶּלֶךְ), all garden of ׳בּ; according to DieulafoyRŠJ 1888, cclxxvii. throne-room, synonym of apadâna in meaning, but compare אַמֶּדֶן.
בֵּית
preposition between, see [בַּיִן] below בין.