1. In
medication and biology, a prefix denoting the
concept of after, subsequent to, behind, or hindmost.
Compare: post-.
2. In chemistry, an italicised prefix denoting joint,
action sharing.
3 (m-). In chemistry, an italicised prefix denoting
compound formed by
two substitutions in the
benzene ring separated by one
carbon atom, i.e.,
linked to the
first and third,
second and fourth, etc.,
carbon atoms of the ring. For terms beginning with meta-, or m-,
see the
specific name.
Origin: G. After, between, over