A bone having a thin, flattened shape, as the scapula.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Examples from the Web for flat bone
Historical Examples of flat bone
Flat-bone steak, as shown in Fig. 10, has a large bone, but it also contains a considerable amount of fairly solid meat.Woman's Institute Library of Cookery, Vol. 3
Woman's Institute of Domestic Arts and Sciences