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whirligig beetle

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