from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun 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.
- noun any bone that develops within membranous tissue without previous cartilage formation; e.g. the clavicle and bones of the skull
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