geotactic
adjective
geo·tac·tic ˌjē-ō-ˈtak-tik 
: of or relating to geotaxis
Word History
Etymology
geo- + -tactic, after German geotaktisch (formed after Geotaxis geotaxis)
First Known Use
1899, in the meaning defined above
Medical Definition
geotactic
adjective
geo·tac·tic ˌjē-ō-ˈtak-tik
: of or relating to geotaxis