ortho

  1. Noun.  (chemistry) An isomer of a benzene derivative having two substituents adjacent on the ring.
  2. Noun.  (astronomy) A certain type of flat eyepiece.
  3. Noun.  (photography, dated) An orthochromatic plate.
  4. Noun.  (context, imaging) An orthophoto.

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This entry was last updated on RefTopia from its source on 3/20/2012.