aeolipilae
aeŏlĭpĭlae, ārum, f. [aeolus-pila],
- vessels (or instruments) for investigating the nature of the wind, eolipiles, Vitr. 1, 6.
aeolipilae, ārum, f. (Aeolus u. pila, Ball), Windkugeln, zur Bestimmung der Windrichtung, Vitr. 1, 6, 2.