optic_axis
1. [ noun ] (geometry) a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted
Synonyms: principal_axis
Related terms: axis
Similar spelling:   optic_disk
  optic_disc
  optical_disk
  optical_disc
  optic_chiasm
  optical_prism
  optical_maser
  optic_chiasma
  optical_lens
  optic_cup
  optical_glass