parachordal
/ˌparəˈkɔːdl/Embryology
adjective
Situated beside the notochord; specifically designating either of a pair of cartilaginous plates which form the foundation of the skull in mammalian embryos.
noun
A parachordal cartilage.
Origin
Late 19th century; earliest use found in Thomas Huxley (1825–1895), biologist and science educationist. From para- + chord + -al.