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Word: ortho- (lookup usage) (lookup stats)


Meaning:

Prefix:

  • chemistry Having an extra proportion of water
  • chemistry in isomeric benzene derivatives, having the two substituents in adjacent positions (compare meta- and para-)
  • physics of any molecule of the form X2 in which the two nuclei have parallel spin
  • straight, right, proper

Source: Wiktionary | Src Info »