from the GNU version of the Collaborative International Dictionary of English
- n. An extinct genus of marine reptiles allied to Plesiosaurus, but having a much shorter neck.
from The Century Dictionary and Cyclopedia
- n. A genus of plesiosaurs from the Middle and Upper Oölite, having the head large and the neck comparatively short. Also Pleiosaurus.
Sorry, no etymologies found.
Natural History Museum in Oslo, Norway has announced the discovery of one of the largest dinosaur-era marine reptiles ever found - an enormous sea predator known as a pliosaurus estimated to be almost 15 meters (50 feet) feet long.
Land reptiles abounded, including species of the pterodactyle of the preceding age -- tortoises, trionyces, crocodilians -- and the pliosaurus, a creature which appears to have formed a link between the plesiosaurus and the crocodile.