Aolipile
Aolipile ({not transcribed}) , noun
[Latin aeolipilae; Aeolus god of the winds + pila a ball, or Greek {not transcribed} gate (i. e., doorway of Aolus); compare French éolipyle.]
An apparatus consisting chiefly of a closed vessel (as a globe or cylinder) with one or more projecting bent tubes, through which steam is made to pass from the vessel, causing it to revolve.
Such an apparatus was first described by Hero of Alexandria about 200 years b. c. It has often been called the first steam engine.
Also: AEolipyle, AEolipile