ˈdelphinoid,a.andn.Zool. [ad.Gr. δελϕινοειδής like a dolphin, f. δελϕίν dolphin.] A.adj. Like or related to a dolphin; belonging to the Delphinoidea, a division of the Cetacea, which includes the dolphins and seals. In mod. Dicts. B.n. A member of the Delphinoidea.