Wiktionary
n. An incomplete fracture of a long bone in which one side of a bone is broken while the other is bent
WordNet
n. a partial fracture of a bone (usually in children); the bone is bent but broken on only one side
Wikipedia
A greenstick fracture is a fracture in a young, soft bone in which the bone bends and breaks. Greenstick fractures usually occur most often during infancy and childhood when bones are soft. The name is by analogy with green (i.e., fresh) wood which similarly breaks on the outside when bent. It was discovered by British-American orthopedist, John Insall, and Polish-American orthopedist, Michael Slupecki.
Usage examples of "greenstick fracture".
In the direct view the flesh appeared to melt away from the bone, showing a ragged break much like a greenstick fracture, with little chips floating around it.
A greenstick fracture of the ulna was visible but the injury was so well healed that the splint and bandage were superfluous.
The man gave a hoarse yell of pain, not only for his jolting hit to the ground, but for his greenstick fracture.
He heard Dr Handor telling his ma that it was a greenstick fracture, no more serious than any childhood break: 'It's the sort of break kids get falling out of trees,' he said, and Eddie heard his ma respond furiously: 'Eddie doesn't climb trees!
He felt the splintered ends of the greenstick fracture grind together.
My right arm had whipped around behind me when I went down, and I had sustained a nasty greenstick fracture of the forearm.