Definition of "water scorpion" []

• Any of various aquatic insects of the family Nepidae, having a large breathing tube projecting from the posterior part of the abdomen and inflicting a painful sting. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.