noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   Any of the genus †Plesiosaurus of extinct long-necked marine reptiles from the Early Jurassic.

   ""Plesiosaurus! A fresh-water plesiosaurus!" cried Summerlee."

2. 2
   extinct marine reptile with a small head on a long neck and a short tail and four paddle-shaped limbs; of the Jurassic and Cretaceous wordnet

Synonyms

All synonyms

plesiosaurplesiosaur

Example

More examples

"Plesiosaurus saw a few steamboats and there was no end to his madness."

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.