dentalium

noun
  1. A small marine mollusk with a slender, curved, tusk-like shell, found in shallow to deep ocean waters.
  2. Usage: Also called tusk shell or tooth shell.; Genus Dentalium and related genera.
  3. The shell of a dentalium mollusk, historically used as currency or ornament by certain Native American peoples.
  4. Usage: Cultural and historical context; valued in Pacific Northwest trade.

Examples