Cetacean
Part of speech: adjective
Definition: Pertaining to the zoologic order Cetacea, or associated with species falling under that taxonomic hierarchy. More generally, relating to large aquatic mammals, either directly or by analogy.
Part of speech: noun
Definition: An animal belonging to the order Cetacea, including dolphins, porpoises, and whales.
Cetaceous
Part of speech: adjective
Definition: Relating to whales or more generally to any marine mammal of the order Cetacea.