Krummhorn \Krumm"horn`\, Krumhorn \Krum"horn`\ (kr[=oo]m"h[^o]rn`), n. [G. krummhorn cornet; krumm crooked + horn horn.] (Mus.) (a) A reed instrument of music of the cornet kind, now obsolete (see {Cornet}, 1, a.). (b) A reed stop in the organ; -- sometimes called {cremona}.