The story
- Ancient Greek · derived fromπρωτο-“proto-, first”
- English todayprototherian
From translingual Prototheria + -an, from Ancient Greek πρωτο- (prōto-, “proto-, first”) + θηρίον (thēríon, “beast”).
Words from the same roots
Ancient Greekπρωτο- all →
protoplastproto-protoduliaprotozeugma
Etymology from Wiktionary, CC BY-SA 4.0.