aeolipile
noun
ae·ol·i·pile
variants:
or less commonly aeolipyle
or eolipile \ ē-ˈä-lə-ˌpīl \
plural -s
Definition of aeolipile
: 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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