from
The Collaborative International Dictionary of English v.0.48
Para- \Par"a-\ [Gr. para` 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.
[1913 Webster]
2. (Chem.) 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.
[1913 Webster]