para-

Webster's Dictionary (1913)

Origin: Gr. παρά beside; prob. akin to E. for- in forgive. Cf. For-.

1. A prefix signifying alongside of, beside, beyond, against, amiss; as parable, literally, a placing beside; paradox, that which is contrary to opinion; parachronism.

2. Chemistry A prefix denoting: (a) Likeness, similarity, or connection, or that the substance resembles, but is distinct from, that to the name of which it is prefixed; as paraldehyde, paraconine, etc.; also, an isomeric modification. (b) Specifically: Organ. Chem. That two groups or radicals substituted in the benzene nucleus are opposite, or in the respective positions 1 and 4; 2 and 5; or 3 and 6, as paraxylene; paroxybenzoic acid. Cf. Ortho-, and Meta-. Also used adjectively.

Webster’s Revised Unabridged Dictionary (1913), from GCIDE 0.54