aeolipile
noun
ae·ol·i·pile
variants
or less commonly aeolipyle
or eolipile
ē-ˈä-lə-ˌpīl
plural -s
: an apparatus that was invented in the second century b.c. and is often called the first steam engine and that consisted essentially of a closed vessel (as a globe or cylinder) with one or more projecting bent tubes out of which steam is made to pass from the vessel, the action of the steam jets causing it to revolve
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Merriam-Webster unabridged
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