Definition of diaphysis in English:



  • The shaft or central part of a long bone.

    Compare with epiphysis
    • ‘The forces of the two opposing groups of muscles result in twisting of the epiphysis and the diaphysis in opposite directions.’
    • ‘The grafts were mounted onto steel cables and snap hooks in the load frame using either the holes in the tibial diaphysis or tendon graft loops.’
    • ‘Interposed between the epiphysis and the diaphysis is the cartilaginous epiphyseal plate.’
    • ‘The tumor is eccentric, usually metaphyseal, but it may extend into the epiphysis or along the medullary cavity into the diaphysis.’
    • ‘In both fetal and post-natal growth, the cartilage is replaced by bone in a process known as endochondral ossification, in which ossification starts in the centers (diaphyses) of the long bones and spreads outward.’


Mid 19th century: from Greek diaphusis ‘growing through’, from dia ‘through’ + phusis ‘growth’.