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1. One who plays on a pipe, or the like, especially. On a bagpipe. The hereditary piper and his sons.

2. (Science: zoology) A common European gurnard (Trigla lyra), having a large head, with prominent nasal projection, and with large, sharp, opercular spines. A sea urchin (Goniocidaris hystrix) having very long spines, native of both the American and European coasts. To pay the piper, to bear the cost, expense, or trouble.