cosmoid


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cosmoid

(of the scales of coelacanths and lungfish) consisting of an outer layer of cosmin (which resembles dentine), a mid-layer of spongy bone and a lower layer of bony lamellae. Compare GANOID, PLACOID.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005