Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A bone that forms directly in membranous connective tissue, as some cranial bones, instead of developing from cartilage.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. any bone that develops within membranous tissue without previous cartilage formation; e.g. the clavicle and bones of the skull

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