Ŏm'pha-lōp'ter or Ŏm'pha-lōp'tie, n.

n. [Gr. ὀμφαλός, the navel, and ὀπτήρ, one who looks, ὀπτικός, belonging to sight, from the root ὀπ, to see; Fr. omphaloptre.] An optical glass that is convex on both sides; a double-convex lens. [Obs.] Hutton.