Pronunciation: (ar"u-thOO'zu),[key] —n. 1. Also called dragon's mouth, swamp pink. an orchid, Arethusa bulbosa, of eastern North America, having a solitary pink flower with a blotched, fringed lip: now rare.
2. (cap.) Class. Myth.a nymph who was changed into a spring to save her when she was being pursued by the river god Alpheus.