ˌperəˈsfiŋ(k)(ˌ)tēz noun
Usage: capitalized
Etymology: New Latin, from peri- + -sphinctes (from Greek sphinktos tightly bound, from sphingein to bind fast) — more at sphincter
: a genus (the type of the family Perisphinctidae) comprising discoidal ammonites having bifurcating ribs not interrupted on the ventral side and being characteristic of the Upper Jurassic
• peri·sphinc·toid | ̷ ̷ ̷ ̷|sfiŋ(k)ˌtȯid adjective