[1865–70; ‹ Gk aiólo(s) fickle, changeful + -tropic]This word is first recorded in the period 1865–70. Other words that entered Englishat around the same time include: black belt, dunk, figure skating, racism, springboard-tropic is a combining form with the meanings “turned toward, with an orientation toward”that specified by the initial element (geotropic), “having an affinity for, affecting” what is specified (lipotropic; neurotropic; psychotropic), “affecting the activity of, maintaining” a specified organ (gonadotropic)