terrane

[tuh-reyn, ter-eyn] /təˈreɪn, ˈtɛr eɪn/
noun, Geology
1.
any rock formation or series of formations or the area in which a particular formation or group of rocks is predominant.
Also, terrain.
Origin
1815-25; spelling variant of terrain
British Dictionary definitions for terrane

terrane

/ˈtɛreɪn/
noun
1.
a series of rock formations, esp one having a prevalent type of rock
2.
an allochthonous, fault-bounded section of the earth's crust
Word Origin
C19: see terrain