long bone definition by American Heritage Dictionary
nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Any of several elongated bones of vertebrate limbs that have a roughly cylindrical shaft containing marrow.
long bone - Medical Definition
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.