ICHTHYOSAURI
ICHTHYOSAURUS
ichthyosaurus
(noun) ichthyosaurs of the Jurassic
Source: WordNet® 3.1
Noun
ichthyosauri
plural of ichthyosaur
Source: Wiktionary
ICHTHYOSAURUS
Ich`thy*o*sau"rus, n.; pl. Ichthyosauri. Etym: [NL., fr. Gr.
'ichqy`s, -y`os, a fish + say^ros a lizard.] (Paleon.)
Definition: An extinct genus of marine reptiles; -- so named from their
short, biconcave vertebræ, resembling those of fishes. Several
species, varying in length from ten to thirty feet, are known from
the Liassic, Oölitic, and Cretaceous formations.
Source: Webster’s Unabridged Dictionary 1913 Edition