In scientific usage, any of the animals belonging to the clade Dinosauria, especially those that existed during the Triassic, Jurassic and Cretaceous periods and are now extinct.

Any of many marine protozoa of the phylum Dinoflagellata, which have two flagella.

plural of dinoflagellate

Any therapsid of the suborder Dinocephalia

Of or pertaining to these creatures

plural of dinocephalian

plural of dinomastigote

(microbiology) A dinoflagellate of the phylum Dinomastigota.

Any of various extinct mammals, of the order †Dinocerata, somewhat similar to the rhinoceros.

Any extinct arthropod-like marine animal of the class Dinocaridida.