Source : Webster's Revised Unabridged Dictionary (1913)

Troche \Tro"che\ (tr[=o]"k[=e]), n. [Gr. trocho`s anything round
   or circular, a wheel, properly, a runner, fr. tre`chein to
   run. Cf. {Trochee}.] (Pharm.)
   A medicinal tablet or lozenge; strictly, one of circular
   form.

Source : WordNet®

troche
     n : a medicated lozenge used to soothe the throat [syn: {cough
         drop}, {pastille}, {pastil}]