Megilph, Megilp n. (Written also magilp, and magilph) (Paint.) A gelatinous compound of linseed oil and mastic varnish, used by artists as a vehicle for colors.
... he, springing to his feet and shaking his fist at the picture. "More good, by Jupiter, than all the paint and megilp that ever was wasted! Not all the fine arts of Europe are worth a poulet a la Marengo and a bottle of ... — In the Days of My Youth • Amelia Ann Blandford Edwards