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What does ortho- mean?

Looking for the meaning or definition of the word ortho-? Here's what it means.

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