τρόπος
trópos
“turn, direction”
4 words in English grow from this root.
Isotropic
Scienceἴσοςísos
“equal in every turning”
Isotropy
Earthἴσοςísos
“equal in every direction”
Trope
Wordsτρόποςtrópos
“a turn”
Tropopause
Earthτρόποςtrópos
“where the turning stops”