Definition of "gnat" []

• Any of various small, biting, two-winged flies, such as a punkie or black fly. (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.

• "Palin also ridicules her former fiance, Levi Johnston who she describes as a "gnat ... constantly spreading false accusations against our family.""
• "Swinging the sledgehammer to swat at a gnat is sure to cause some collateral damage."
• "Palin's book, co-written by Nancy French, covers her family and her mom's run for vice president, but focuses on Johnston, whom she calls a "gnat ... constantly spreading false accusations" against her family."