\Par`a*gen"e*sis\, n. [NL.; para- + genesis.]
(Geol.)
(a) The formation of minerals in contact, so as to affect one
    another's development.
(b) The order in which minerals occurring together in rocks
    and veins have developed.

\Par`a*gen"e*sis\ (p[a^]r`[.a]*j[e^]n"[-e]*s[i^]s),
n. [Pref. para- + genesis.] (Min.)
The science which treats of minerals with special reference
to their origin.