dermal bone
Zoology
noun
A bone that does not have a cartilaginous precursor and is formed by differentiation of dermal mesenchyme cells into osteoblasts; specifically one which is connected with the ectodermal basement membrane by dentine or enamel, or which is homologous with such a bone.
Origin
Mid 19th century; earliest use found in Gideon Mantell (1790–1852), surgeon and geologist.