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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).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(General Physics) a device illustrating the reactive forces of a gas jet: usually a spherical vessel mounted so as to rotate and equipped with angled exit pipes from which steam within it escapes
[C17: from Latin aeolīpilae balls of Aeolus or aeolīpylae gates of Aeolus]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014