Source : Webster's Revised Unabridged Dictionary (1913)

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}.]

Source : WordNet®

aitchbone
     n : a cut of beef including the H-shaped rump bone