I was working on something involving psychotropic drugs, and it got me wondering what the relationship was between a mind-altering substance and a torrid climate ... other than that the pretty poppies grow nicely there, I mean.

And so we learn that "tropic" is ME tropik, LL tropicus, Gr tropikos, belonging to a turn (of the sun at the solstices), from trope, a turn.

I just thought I'd share.