The Collaborative International Dictionary of English v.0.48:

Aquila \Aq"ui*la\, n.; pl. Aquil[ae]. [L., an eagle.]
   1. (Zool.) A genus of eagles.
      [1913 Webster]

   2. (Astron.) A northern constellation southerly from Lyra and
      Cygnus and preceding the Dolphin; the Eagle.
      [1913 Webster]

   Aquila alba [L., white eagle], an alchemical name of
      calomel. --Brande & C.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Calomel \Cal"o*mel\ (k[a^]l"[-o]*m[e^]l), n. [Gr. kalo`s
   beautiful + me`las black. So called from its being white,
   though made from a black mixture of mercury and corrosive
   sublimate. Cf. F. calom['e]las.] (Chem.)
   Mild chloride of mercury, Hg2Cl2, a heavy, white or
   yellowish white substance, insoluble and tasteless, much used
   in medicine as a mercurial and purgative; mercurous chloride.
   It occurs native as the mineral horn quicksilver.
   [1913 Webster]

WordNet (r) 3.0 (2006):

calomel
    n 1: a tasteless colorless powder used medicinally as a
         cathartic [syn: calomel, mercurous chloride]