arm bone

nouns

a bone in the arm
arm bone
is a part of
a human limb; technically the part of the superior limb between the shoulder and the elbow but commonly used to refer to the whole superior limb
arm
is a part of
the internal skeleton; bony and cartilaginous structure (especially of vertebrates)
endoskeleton
is a type of (narrower)
in limbs of vertebrate animals: a long cylindrical bone that contains marrow
long bone, os longum