extinct aquatic reptile, 1830, Modern Latin, from Latinized form of Greek ikhthys "fish" (see ichthyo-) + -saurus. Related: Ichthyosaurus (1819); ichthyosaurian.
word-forming element meaning "fish," from Latinized form of Greek ikhthys "a fish" (in plural, "a fish-market"), from PIE root *dhghu- "fish" (source also of Armenian jukn, Lithuanian žuvis).
element used in forming dinosaur names, from Latinized form of Greek sauros "lizard," a word of unknown origin; possibly related to saulos "twisting, wavering."
updated on November 06, 2015