/ar'euh thooh"zeuh/ , 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.
[ 1810-20; ( Aréthousa ]