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doctorfish

[dok-ter-fish]
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noun, plural doc·tor·fish·es, (especially collectively) doc·tor·fish.
  1. a surgeonfish, especially Acanthurus chirurgus, of the West Indies, having a bluish body and black tail.

Origin of doctorfish

First recorded in 1825–35; so named from the knifelike rays on its tail
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018