noun
(countable, chemistry) An isomer of a benzene derivative having two substituents adjacent on the ring.
(countable, astronomy) A certain type of flat eyepiece.
(countable, photography, dated) An orthochromatic plate.
(countable, linguistics) Clipping of orthography.
(countable, photography) Clipping of orthophoto.
(uncountable, medicine) Clipping of orthopedics.
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