Hippodrome: A theater.  In ancient times, a race course for horses.

This word has changed quite a bit.  These days, a hippodrome is a large performance locale.  In the old days, a hippodrome was a horse race track.  If you have ever watched Ben Hur, you have seen a hippodrome. 

In a terrifying new development, the African hippopotamus has evolved.  It can now fly.  The locals are calling it the Hippodrone.  But, that has nothing to do with a hippodrome.

Hippodrome comes from two Greek words. The word ἳππος (hippos) means, horse.  Δρόμος (drοmos), of course, means, course.  

Wondering how I came up with that last sentence?  I used to work for the Department of Redundancy Department.