/ring'koh seuh fayl"yeuhn, -fay"lee euhn/ , adj.
1. belonging or pertaining to the Rhynchocephalia, an order of lizardlike reptiles that are extinct except for the tuatara.
n.
2. a rhynchocephalian reptile.
[ 1865-70; Rhynchocephali ( a ) name of the order ( rhýncho ( s ) snout + NL -cephalia; see CEPHAL-, -IA) + -AN ]