An Etymological Dictionary of Astronomy and Astrophysics

A round vessel pivoted on a central axis that rotates by the force of internal steam escaping from two diametrically opposed narrow apertures. Aeolipile, first described by Hero of Alexandria (c. 10-70 AD), is an early example of → jet propulsion.

See also: L aeolipila, from Gk aiolipyle, from
Aiolon pyle, fr. aioli-, from Aiolos “god of wind,” +
pyle “gate.”