See the entire entry for mašṭāḥ, mašṭāḥā n.m. expanse

TgJ 2K18:17 :בִמזִקַת בְרֵיכְתָא עִילִיתָא דִבכֵיבַש חְקַל מַשטַח קָצְרַיָא : at the upper conduit that is on the path to the expanse of the fullers' field

See the entire entry for qāṣar, qāṣrā n.m. fuller