The Collaborative International Dictionary of English v.0.48:

Nombles \Nom"bles\, n. pl. [F. nombles, fr. L. lumbulus, dim. of
   lumbus a loin. Cf. Numbles, Umbles, Humbles.]
   The entrails of a deer; the umbles. [Written also numbles.]
   --Johnson.
   [1913 Webster]