Source : Webster's Revised Unabridged Dictionary (1913)

Ague \A"gue\, n. [OE. agu, ague, OF. agu, F. aigu, sharp, OF.
   fem. ague, LL. (febris) acuta, a sharp, acute fever, fr. L.
   acutus sharp. See {Acute}.]
   1. An acute fever. [Obs.] ``Brenning agues.'' --P. Plowman.

   2. (Med.) An intermittent fever, attended by alternate cold
      and hot fits.

   3. The cold fit or rigor of the intermittent fever; as, fever
      and ague.

   4. A chill, or state of shaking, as with cold. --Dryden.

   {Ague cake}, an enlargement of the spleen produced by ague.
      

   {Ague drop}, a solution of the arsenite of potassa used for
      ague.

   {Ague fit}, a fit of the ague. --Shak.

   {Ague spell}, a spell or charm against ague. --Gay.

   {Ague tree}, the sassafras, -- sometimes so called from the
      use of its root formerly, in cases of ague. [Obs.]