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haltere

British  
/ ˈhæltɪə, ˈhæltə /

noun

  1. Also called: balancer.  one of a pair of short projections in dipterous insects that are modified hind wings, used for maintaining equilibrium during flight

"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

Etymology

Origin of haltere

C18: from Greek haltēres (plural) hand-held weights used as balancers or to give impetus in leaping, from hallesthai to leap

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.