The Collaborative International Dictionary of English v.0.48:
Aitchbone \Aitch"bone`\, n. [For nachebone. For loss of n, cf. Adder. See Natch.] The bone of the rump; also, the cut of beef surrounding this bone. [Spelt also edgebone.] [1913 Webster]WordNet (r) 3.0 (2006):
aitchbone n 1: a cut of beef including the H-shaped rump bone