ge·o·man·cy (jē'ə-mān'sē) n. Divination by means of lines and figures or by geographic features.
[Middle English geomancie, from Medieval Latin geōmantia, from Late Greek geōmanteia, divination by signs from the earth : Greek geō-, geo- + Greek -manteia, -mancy.] ge'o·man'cer n., ge'o·man'tic (-tĭk) adj.
"art of divination by means of signs derived from the earth," 1362, from Fr. geomancie, from L. geomantia, from late Gk. *geomanteia, from geo-, comb. form of ge "earth" + manteia "divination."