Definition of dermal bone in US English:

dermal bone

noun

Zoology
  • 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.