Any small marine gastropod shell of the genus Littorina. The common European species (Littorina littorea), in Europe extensively used as food, has recently become naturalized abundantly on the American coast. See Littorina.
Periwinkle is a desaturated color in the blue/indigo/violet family. Its name is derived from the lesser periwinkle or myrtle herb (Vinca minor) which bears flowers of the same color. Periwinkle is also called lavender blue.
Periwinkle contains two anticancer alkaloids â€“ vincristine and vinblastine â€“ that inhibit the growth of tumors. Vincristine is most effective in treating childhood leukemia. Vinblastine is used in treating testicular cancer and Hodgkin's disease .