chondrocraniumPronunciation: /ˌkɒndrə(ʊ)ˈkreɪnɪəm/Definition of chondrocranium noun Zoology & Embryology the primary skull of vertebrates, composed of cartilage, which in humans and most other vertebrates is replaced by bone during development. chondrocranium in other Oxford dictionaries Definition of chondrocranium in the US English dictionary