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.

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.

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.