Troche
A small medicated lozenge designed to dissolve.
For example, to soothe the throat as a cough drop.
Strictly speaking, a troche should be circular since the word derives from the Greek 'trokhiskos' meaning 'a little wheel.' Pronounced trOh-key.
Sometimes mistakenly pronounced trOhsh or trOhshay under the misapprehension that it is a French word.