The Collaborative International Dictionary of English v.0.48:

Magilp \Ma*gilp"\, Magilph \Ma*gilph"\, n. (Paint.)
   See Megilp.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Megilp \Me*gilp"\, Megilph \Me*gilph"\, n. (Paint.)
   A gelatinous compound of linseed oil and mastic varnish, used
   by artists as a vehicle for colors. [Written also magilp,
   and magilph.]
   [1913 Webster]