Ichthyopˈsida plural noun

A group of vertebrates in Huxley's classification comprising amphibians, fishes and fish-like vertebrates

Ichthyopterygia /-op-tər-ijˈi-ə/ plural noun

(Gr pterygion a fin, dimin of pteryx wing) the Ichthyosauria

ichthyorˈnis noun

(Gr ornis a bird) an extinct Cretaceous sea bird of the genus Ichthyornis with reptilian teeth set in sockets

ichthyosaur /ikˈthi-ō-sör/ or ichthyosauˈrus noun

(Gr sauros lizard) any Mesozoic extinct marine reptile of the order Ichthyosauˈria, with a fish-shaped body and elongated snout similar to dolphins

ichthyosaurˈian adjective

ichthyōˈsis noun

A rare inherited condition in which the skin becomes thickened, scaly and rough, due to an abnormality in the production of keratin (also called fish skin disease)

ichthyotˈic adjective