A Lisp variant for the LISP Machine, with object-oriented features, developed by D. Weinreb and D.A. Moon <firstname.lastname@example.org> in 1980. "Classes" were called Flavors in the language.
Though the Flavors design was superseded (notably by the Common LISP CLOS facility), the term "flavor" persisted as a general synonym for "class".
["Object-Oriented Programming with Flavors", D.A. Moon, SIGPLAN Notices 21(11):1-8 (OOPSLA '86), Nov 1986].