aitchbone
noun
aitch·bone ˈāch-ˌbōn 
1
: the hip bone especially of cattle
2
: the cut of beef containing the aitchbone
Word History
Etymology
Middle English hachbon, alteration (resulting from incorrect division of a nachebon) of Middle English *nachebon, from Middle English nache buttock (from Anglo-French, from Late Latin natica, from Latin natis) + bon bone
First Known Use
15th century, in the meaning defined at sense 1