Definitions

1. noun

a small blue-purple flower with five petals, especially the blue forget-me-not, or a plant with similar flowers

“The periwinkle flowers were blooming beautifully in the garden.”

2. noun

a blue or purple colour

“The wall was painted a lovely shade of periwinkle.”

3. adjective

having or relating to the colour blue or purple

“The periwinkle bird had a distinctive blue plumage.”

4. proper noun

a genus of flowering plants, especially the genus Catharanthus.

“The periwinkle is a popular ornamental plant in tropical regions.”