ÆOLIPILE
\ˈe͡ɪəlˌɪpa͡ɪl], \ˈeɪəlˌɪpaɪl], \ˈeɪ_ə_l_ˌɪ_p_aɪ_l]\
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[=e]-ol'i-p[=i]l, n. an instrument consisting of a hollow ball of metal partly filled with water, and having a small orifice through which steam escapes on the application of heat, thus turning the ball. It is the first instrument on record for showing the power of steam. [From L. Æolus, and pila, ball.]
By Thomas Davidson