"Plesiosaurian" Natural Recordings by Native Speakers
Relating to or denoting a marine reptile, especially one of the extinct order Plesiosauria, which lived during the time of the dinosaurs, having a long neck and four flippers.
Plesiosaur: A marine reptile that lived during the time of the dinosaurs, characterized by a long neck, a small head, and four flippers. It is often depicted in popular culture as a large aquatic creature.
A plentiful or ample supply; an abundance. (e.g. "The city has a plethora of museums to visit.")