Wordnet 3.0
NOUN (1)
1.
extinct marine reptile with longer more slender limbs than plesiosaurs and less completely modified for swimming;
The Collaborative International Dictionary of English v.0.48:
nothosaur \nothosaur\ n.
An extinct marine reptile with longer more slender limbs than
plesiosaurs and less completely modified for swimming.
[WordNet 1.5]
WordNet (r) 3.0 (2006):
nothosaur
n 1: extinct marine reptile with longer more slender limbs than
plesiosaurs and less completely modified for swimming