MEGILP
megilp, magilp
(noun) a medium for oil-paints; linseed oil mixed with mastic varnish or turpentine
Source: WordNet® 3.1
Etymology
Noun
megilp (countable and uncountable, plural megilps)
(arts) A mixture of linseed oil with turpentine or mastic varnish, used as a thickener for oil paints but later discredited as a source of cracking and yellowing. [from 18th c.]
Source: Wiktionary
Me*gilp", Me*gilph", n. (Paint.)
Definition: A gelatinous compound of linseed oil and mastic varnish, used
by artists as a vehicle for colors. [Written also magilp, and
magilph.]
Source: Webster’s Unabridged Dictionary 1913 Edition