panhouse noun2 •A building in which seawater is evaporated to make salt.Rather less easy to forecast was the appearance of serious cracks and other flaws in the panhouse masonry. — 1987 •A factory in which raw sugar is refined.The appearance of the Sezela factory has been changed by the erection of a new 100-ft. panhouse as part of Reynolds Brothers Ltd.'s R3½-million expansion project. — 1964 formspanhouses