1. optic disc the point where the optic nerve enters the retina
  2. optic disk the point where the optic nerve enters the retina
  3. optimistic hopeful that the best will happen in the future
  4. optical disc a disk coated with plastic that can store digital data as tiny pits etched in the surface; is read with a laser that scans the surface
  5. optical disk a disk coated with plastic that can store digital data as tiny pits etched in the surface; is read with a laser that scans the surface
  6. apathetic showing little or no emotion or animation
  7. apodictic of a proposition; necessarily true or logically certain
  8. optic axis in a doubly refracting crystal, the line in the direction of which no double refraction occurs
  9. optic tract the cranial nerve that serves the retina
  10. optics the branch of physics that studies the physical properties of light
  11. optic chiasm the crossing of the optic nerves from the two eyes at the base of the brain
  12. didactic instructive, especially excessively
  13. optimism the hopeful feeling that all is going to turn out well
  14. optic chiasma the crossing of the optic nerves from the two eyes at the base of the brain
  15. apodeictic of a proposition; necessarily true or logically certain
  16. magnetic disc (computer science) a memory device consisting of a flat disk covered with a magnetic coating on which information is stored
  17. optimist a person disposed to take a favorable view of things
  18. epideictic designed primarily for rhetorical display
  19. aptitude inherent ability
  20. idiopathic disease any disease arising from internal dysfunctions of unknown cause

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