any of a genus (Vinca) of trailing or erect, evergreen plants of the dogbane family; esp., a creeper (V. minor) with blue, white, or pink flowers, grown as a ground cover
noun
any of a family (Littorinidae) of small, intertidal saltwater snails having a thick, globular shell: some species are edible
the shell of such a snail
See periwinkle in American Heritage Dictionary 4
(pĕrˈĭ-wĭngˌkəl)
noun
Any of several small, often edible marine snails, especially of the genus Littorina, having thick, cone-shaped, whorled shells.
The shell of any of the periwinkles.
(pĕrˈĭ-wĭngˌkəl)
noun
Any of several shrubby, trailing, evergreen plants of the genus Vinca, especially V. minor, having glossy, dark green, opposite leaves and flowers with a blue, funnel-shaped corolla. Also called myrtle.
Any of several erect herbs of the genus Catharanthus, especially C. roseus, having flowers with a rose-pink or white salverform corolla and a closed throat.