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waterscorpion

[waw-ter-skawr-pee-uh n, wot-er-]
noun
  1. any of several predaceous aquatic bugs of the family Nepidae, having clasping front legs and a long respiratory tube at the rear of the abdomen: capable of biting if handled.
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Origin of waterscorpion

First recorded in 1675–85; water + scorpion
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018