Entry 1 sense Webster, 1913 Krummhorn /(kro͞om"hôrn`)/ · Krumm·horn · IPA /ˈkɹʌmhɔːn/ 01 n. A reed instrument of music of the cornet kind, now obsolete (see Cornet, 1, a.). 1. A reed instrument of music of the cornet kind, now obsolete (see Cornet, 1, a.).(Mus.) See: Cornet