Coquillage.
1. Small edible marine snail; steamed in wine or baked; SYN. winkle.
2. Edible marine gastropod; SYN. winkle.
(snail)
3. Any marine snail of the family Littorinidae, found on the shores of Europe and E North America. Periwinkles have a conical spiral shell, and feed on algae.