cartilage (n.), cartilaginous (adj.)

https://doi.org/10.1351/goldbook.10494

Specialized, fibrous connective tissue present in adults, forming the temporary skeleton in the embryo, providing a model in which the bones develop, and constituting a part of the organism’s growth mechanism.

Source:
PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 733 [Terms] [Paper]