For what little this is worth, I recall when I first investigated the term, “lozenge.” In New England, as a child, in the 1960’s, the term “lozenge” appeared in my lexicon as a generic term referring to a single piece of medicine such as a “cough drop.” The term applied also to some hard candies but with some implied medicinal value. In my mind’s eye, “lozenges” were small, colorfully transparent, flat with definite sides and corners, and flavored strongly, sometimes sweetly. The taste of horehound comes to mind.
In the 1970’s I ran across the term “lozenge” in a work of fiction. The author used the phrase, “lozenge of light.” I thought this was a novel use of the term so I looked it up. I came away with the understanding that the term referred to the properties of the shape I understood “lozenges” to have. This is what I recall and memory certainly fades.
Interestingly, in New England at that time, we (children, especially) referred to all soft-drinks with the generic term “tonic,” as in, “What would you like to drink?” and the response, “I’ll have a tonic.” That term also appears to me to have similar medicinal connotation. It was only when I become less parochially restricted that I discovered the rest of the world considered my use of “tonic” to be quaint and served mainly to pigeon-hole me as a “Yankie,” south of the Mason-Dixon line.