Para- ::
Para- () 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..