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  1. Prefix denoting a departure from the normal.
  2. Prefix denoting involvement of two like parts or a pair.
  3. Prefix denoting adjacent, alongside, near.
  4. In chemistry, an italicized prefix denoting two substitutions in the benzene ring arranged symmetrically, linked to opposite carbon atoms in the ring. For words beginning with para- or p-, see the specific name.

[G. alongside, near]

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