1. the hard protective outer coverings of marine mollusks, found on beaches after the animals have died

Examples

• The children collected colorful seashells along the shore.
• She found a perfect conch seashell during her morning walk.
• The beach was covered with broken seashells and sand.
• He held the seashell to his ear to hear the ocean sound.
• The gift shop sold polished seashells and coral jewelry.
• Seashells wash up on the beach with each incoming tide.