\Ter"rane\, n. (Geog.)
A region or limited area considered with reference to some
special feature; as, the terrane of a river, that is, its
drainage basin.

\Ter"rane\, n. [F. terrain, from L. terra earth.]
(Geol.)
A group of rocks having a common age or origin; -- nearly
equivalent to formation, but used somewhat less
comprehensively.