hairline fracture 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.
A minor fracture in which the bone fragments remain in alignment, appearing on x-ray film as a fine line.
hairline fracture - Medical Definition
A fracture in which the fragments do not separate because the line of break is so fine. Also called capillary fracture.