The Collaborative International Dictionary of English v.0.48:

cromorna \cro*mor"na\ (kr[-o]*m[^o]r"n[.a]), n. [F. cromorne
   (cf. It. cromorno), fr. G. krummhorn crooked horn, cornet, an
   organ pipe turned like a trumpet; krumm crooked + horn horn.]
   (Mus.)
   A certain reed stop in the organ, of a quality of tone
   resembling that of the oboe. [Corruptly written cromona.]
   [1913 Webster]