periwinkle

Short definition from Wiktionary

Noun

1. 1
   Any of several evergreen plants of the genus Vinca with blue or white flowers.
2. 2
   Similar plants of genus Catharanthus.
3. 3
   A color with bluish and purplish hues, somewhat light.
4. 4
   A mollusk of family Littorinidae.

Adjective

1. 1
   Of pale bluish purple colour.