chondrocranium
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chon·dro·cra·ni·um
(kŏn′drō-krā′nē-əm)n. pl. chon·dro·cra·ni·ums or chon·dro·cra·ni·a (-nē-ə)
1. The cartilaginous cranium of an embryo before ossification.
2. A portion of the embryonic cranium forming the bones of the base of the skull and eventually undergoing ossification.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
chondrocranium
(ˌkɒndrəʊˈkreɪnɪəm)n
the cartilaginous structure that, in early development, envelops the brain
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014