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whirligig beetle

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noun
  1. any of numerous aquatic beetles of the family Gyrinidae, commonly seen in groups circling about rapidly on the surface of the water.

Origin of whirligig beetle

First recorded in 1850–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for whirligig beetle

whirligig beetle

noun
  1. any flat-bodied water beetle of the family Gyrinidae, which circles rapidly on the surface of the water
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012