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giant water bug

noun
1.
See under water bug.

water bug

noun
1.
any of various aquatic bugs, as of the family Belostomatidae (giant water bug)
2.
(loosely) a large cockroach, especially the American cockroach.
Origin
1740-1750
1740-50
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for giant water bug

water bug

noun
1.
any of various heteropterous insects adapted to living in the water or on its surface, esp any of the family Belostomatidae (giant water bugs), of North America, India, and southern Africa, which have flattened hairy legs
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
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Encyclopedia Article for giant water bug

any wide and flat-bodied aquatic insect of the family Belostomatidae (order Heteroptera). This family, although containing only about 100 species, includes the largest bugs in the order: sometimes exceeding 10 cm (4 inches) in the South American species Lethocerus grandis and ranging between 2 and 5 cm in northern climates. These insects are usually seen suspended in a quiet pond or lake, the tip of their abdomen piercing the water surface and the brown, oval body hanging below.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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