from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Anatomy The shaft of a long bone.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The central shaft of any long bone
from the GNU version of the Collaborative International Dictionary of English
- n. An abnormal prolongation of the axis of inflorescence.
- n. The shaft, or main part, of a bone, which is first ossified.
from The Century Dictionary and Cyclopedia
- n. In botany, an abnormal elongation of the axis of a flower or of an inflorescence; a form of prolification.
- n. In anatomy, the continuity of a bone between its two ends; the shaft of a long bone, as distinguished from its epiphyses or apophyses.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the main (mid) section of a long bone
I do not think that wrenches of the knee-joint in the act of falling can be suggested as an explanation of the frequency of effusions into that articulation, since the fractures of the femur were not always received while the erect position was maintained, and effusion was most marked when the diaphysis was the part affected, the latter point illustrating the greater resistance offered by compact bone.
The ulnae possess a lateral groove along the dorso-lateral surface of the diaphysis, which is lacking in NMVP 186076 and
A typical long bone has a diaphysis or shaft and two epiphyses or ends.
These are connected together at the foot, and form a common epiphysis, but they are not united together along the line of the leg; and at the thigh they are united together and form an epiphysis, and this epiphysis has a diaphysis; but the other bone in a line with the little toe is a little longer.
But the visual accompanying this text is seems to show the division between the shaft (diaphysis) and end (epiphysis) of the bone.
For the fish has a diaphysis or cloven growth under the belly and abdomen (like the blind snakes), and, after it has spawned by the splitting of this diaphysis, the sides of the split grow together again.
Showing shortening of bone, owing to a lateral approximation of the diaphysis because of muscular contraction.
-- According to Cadiot and Almy,  "regardless of the location of femoral fractures, the subject is usually intensely lame, the animal frequently walking on three legs -- fractures of the diaphysis are characterized by an abnormal mobility."
Fragilitas of the bone probably exists in many cases when fracture of its diaphysis occurs.
Contraction of muscles also tends to exert traction upon a bone so fractured, resulting in a lateral approximation of the diaphysis and thus preventing union because the broken surfaces are not in proper contact.