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Omphalopter
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.
Meaning of Omphalopter from wikipedia