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diaphysis
The Collaborative International Dictionary
Diaphysis

Diaphysis \Di*aph"y*sis\, n. [Gr. ? a growing through; dia` through + ? to bring forth.]

  1. (Bot.) An abnormal prolongation of the axis of inflorescence.

  2. (Anat.) The shaft, or main part, of a bone, which is first ossified.

Wiktionary
diaphysis

n. (context anatomy English) The central shaft of any long bone

WordNet
diaphysis

  1. n. the main (mid) section of a long bone [syn: shaft]

  2. [also: diaphyses (pl)]

Wikipedia
Diaphysis

The diaphysis is the main or midsection (shaft) of a long bone. It is made up of cortical bone and usually contains bone marrow and adipose tissue (fat).

It is a middle tubular part composed of compact bone which surrounds a central marrow cavity which contains red or yellow marrow. In diaphysis, primary ossification occurs.

Ewing's sarcoma tends to occur at the diaphysis.