An obsolete or dialectal term, possibly referring to a small piece of carmine or a variant of carmine in historical textile terminology.
Possibly a diminutive form combining carmine with the suffix -etta, used in Romance languages to denote smallness or an affectionate version of a term.
This word is so obscure that its exact meaning is lost to time—it's the kind of word that shows how languages constantly create new terms for subtly different things, then forget them.
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