Aquila \Aq"ui*la\, n.; pl. {Aquil[ae]}. [L., an eagle.] 1. (Zo["o]l.) A genus of eagles. 2. (Astron.) A northern constellation southerly from Lyra and Cygnus and preceding the Dolphin; the Eagle. {Aquila alba} [L., white eagle], an alchemical name of {calomel}. --Brande & C.