Category:Aeolipile

Æ*ol"i*pile, Æ*ol"i*pyle, n. Etym: [L. aeolipilae; Aeolus god of the winds + pila a ball, or Gr. i. e., doorway of Æolus); cf. F. éolipyle.]

Defn: 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. [Written also eolipile.]

Note: Such an apparatus was first described by Hero of Alexandria about 200 years b. c. It has often been called the first steam engine.