a small tablet or lozenge, usually a circular one, made of medicinal substance worked into a paste with sugar and mucilage or the like, and dried.
Origin: 1590–1600; back formation from troches, earlier tro(s)chies, late ME trocis (taken as pl.) < MF trocisse < L trochiscus < Gk trochískos, equiv. to troch(ós) wheel (akin to tréchein to run) + -iskos dim. suffix
tro·che (trō'kē) n. A small, circular medicinal lozenge; a pastille.
[Back-formation from Middle English trocis, troches (taken as pl. ), from Old French trocisse, from Late Latin trochiscus, from Greek trokhiskos, diminutive of trokhos, wheel, from trekhein, to run.]