The Collaborative International Dictionary of English v.0.48:

Mistura \Mis*tu"ra\, n. [L. See Mixture.] (Med.)
   (a) A mingled compound in which different ingredients are
       contained in a liquid state; a mixture. See Mixture,
       n., 4.
   (b) Sometimes, a liquid medicine containing very active
       substances, and which can only be administered by drops.
       --Dunglison.
       [1913 Webster]