ae·ol·i·pile 
(ē-ŏlə-pīl′)
(ē-ŏlə-pīl′)n.
A device containing a usually spherical chamber or container, in which steam is heated and ejected through one or more narrow tubes to create propulsion or torque.
[French éolipyle, from Latin aeolipila : Aeolus, god of the winds; see AEOLUS + pila, ball; akin to pilus, hair (Roman leather balls being stuffed with hair).]