noun Anatomy.
the cancellate bony tissue between the hard inner and outer walls of the bones of the cranium.

1690–1700; < Greek diplóē literally, a fold, noun use of feminine of diplóos double

diploic [dih-ploh-ik] , diploetic [dip-loh-et-ik] , adjective
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World English Dictionary
diploë (ˈdɪpləʊˌiː)
anatomy the spongy bone separating the two layers of compact bone of the skull
[C17: via New Latin, from Greek: a fold, from diploos double]

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Medical Dictionary

diploe dip·lo·e (dĭp'lō-ē')
The central layer of spongy, porous, bony tissue between the hard outer and inner bone layers of the cranium.

dip'lo·ic (-lō-ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
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