Bones, anatomically
I believe the answer is:
ossa
'bones anatomically' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ossa that I've seen before include "mountain in Thessaly" , "Legendary mountain" , "Technical name for bones" , "famous mount" , "To pile Pelion upon - is to make even greater" .)