long bone

noun Anatomy, (in vertebrate animals)
any of the long, cylindrical, marrow-containing bones of the limbs: the long bone of the arm.

Origin:
1855–60

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American Heritage
Medical Dictionary

long bone n.
One of the elongated bones of the extremities, consisting of a tubular shaft, which is composed of compact bone surrounding a central marrow-filled cavity, and two expanded portions that usually serve as articulation points.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
He gropes gently back and forth and-so quickly it seems miraculous-extracts a long bone the color of mahogany: a human femur.
It is a long bone, prismatic in form and slightly curved longitudinally.
Among those fossils is a three-inch fragment of the shoulder end of the bird's humerus, the long bone of the upper arm.
Nearby is a long bone, a femur probably, that has been gnawed to a bloodless white.
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