del·phin·i·dae \delˈfinəˌdē\noun plural Usage: capitalized Etymology: New Latin, from Delphinus, type genus + -idae : a family of moderate to small-sized toothed whales including the dolphins, grampuses, and usually the porpoises — see phocaenidae • del·phi·noid\ˈ ̷ ̷fə̇ˌnȯid\adjective or noun