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plural dentalia or dentaliums
Any of various tooth shells of the genus Dentalium. quotations examples
Apart from the two or three bird masks, the only other zoomorphic mask was a wolf frontlet of cedar decorated in micaceous black paint with dentalium teeth, dentalium being an important form of wealth with some of the attributes of a currency.
1999, Jonathan C. H. King, First Peoples, First Contacts: Native Peoples of North America, page 138