omphaloptic

from The Collaborative International Dictionary of English v.0.48

Omphalopter \Om`pha*lop"ter\, Omphaloptic \Om`pha*lop"tic\, n.
   [Gr. ? the navel + ? one who looks, ? belonging to sight: cf.
   F. omphaloptre.]
   An optical glass that is convex on both sides. [Obs.]
   --Hutton.
   [1913 Webster]