Plesiosauroid

Part of speech: noun

Definitions

1. Relating to a group of extinct marine reptiles resembling large aquatic lizards with long necks, broad bodies, and flippers, known from the Mesozoic era
2. Pertaining to a subclass of prehistoric marine reptiles characterized by distinct paddle-like limbs and elongated necks, part of the order Plesiosauria
3. Concerning an extinct taxonomic group of sizable Mesozoic sea reptiles, notable for their aquatic adaptations including fin-like limbs and distinctively long necks

Etymology: "Plesiosaurus," the genus name behind this term, is a New Latin coinage from the Greek "plesios," meaning "near" or "close to," and "sauros," meaning "lizard." The name reflects early assumptions about the animal's relationships. Its long neck and paddle limbs were unlike those of any living lizard, but the first naturalists who studied its fossils placed it near the lizards. The suffix "-oid" comes from the Greek "eidos," meaning "form" or "resemblance." A plesiosauroid is therefore something that resembles a plesiosaur, and the term is used in paleontology for animals that share its body plan without belonging to the same group.