Any of the bones of the arm, particularly the humerus (upper arm bone), radius, or ulna (forearm bones); used in anatomical or archaic contexts.
From Old English arm plus bone, a straightforward compound word. This term is more common in archaic or poetic contexts, with modern anatomy using Latin terms like humerus and radius.
While modern doctors say 'humerus,' older texts called it armbone, showing how English once had simple body-part names before Latin medical terminology took over—but 'funny bone' kept the old tradition alive because 'humerus bone' was too formal for a joke.
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