1. the hard protective covering of a marine mollusk, especially when empty and found on a beach

Examples

• The children collected colorful seashells along the shore.
• She held a large seashell up to her ear to hear the ocean.
• The beach was covered with broken seashells and smooth pebbles.
• He found a perfect spiral seashell in the tide pool.
• The gift shop sold polished seashells and other beach souvenirs.
• Hermit crabs often live in empty seashells for protection.