The Collaborative International Dictionary
Cismontane
Cismontane \Cis*mon"tane\, a. [Pref. cis- + L. mons mountain.] On this side of the mountains. See under Ultramontane.
Douglas Harper's Etymology Dictionary
Wiktionary
cismontane
a. From this side of the mountains.
WordNet
cismontane
adj. on this (the speaker's) side of the mountains; "a contest in Virginia between a cismontane and a tramontane people" [ant: tramontane]