cœlacanthine

Adjective

coelacanthine (comparative more coelacanthine, superlative most coelacanthine)

1. Pertaining to, or having the properties of, a coelacanth (fish).
2. (figuratively) Extremely old-fashioned or atavistic.
   • It must always be remembered that although to an adult a particular belief may seem like a coelacanthine survival from the past, to the schoolchild who learns it from his mate the belief is a novelty; it is something just learnt, and often excitingly full of possibility for his immediate welfare.1959, Iona Opie, Peter Opie, The Lore and Language of Schoolchildren