Definitions from Wiktionary (ortho)

▸ noun:  (countable, chemistry) An isomer of a benzene derivative having two substituents adjacent on the ring.
▸ noun:  (countable, astronomy) A certain type of flat eyepiece.
▸ noun:  (countable, photography, dated) An orthochromatic plate.
▸ noun:  (countable, linguistics) Clipping of orthography. [(linguistics)]
▸ noun:  (countable, photography) Clipping of orthophoto. [An aerial photograph that has been geometrically corrected (orthorectified) such that the scale of the photograph is uniform, meaning that the photo can be considered equivalent to a map.]
▸ noun:  (uncountable, medicine) Clipping of orthopedics. [(medicine) The branch of medicine that deals with the prevention or correction of disorders of the bones and associated muscles and joints]

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