Any of the bones of the skeleton whose length is their greatest dimension, and which typically consist of a slender cylindrical shaft (diaphysis) with wider ends (epiphyses).
Origin
Late 17th century.
Definition of long bone in US English:
long bone
noun
Anatomy Zoology
Any of the bones of the skeleton whose length is their greatest dimension, and which typically consist of a slender cylindrical shaft (diaphysis) with wider ends (epiphyses).