See the entire entry for baṯ, battā/bittā n.m. bath (measure)

TgJ 1K7:38 :אַרבְעִין בַתִין בְרַטִיבָא מַחסֵיל כִיוֹרָא : the basin contains forty baths of liquid

See the entire entry for ḥsl vb. to be completed; to wean