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doohickey

[doo-hik-ee]
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noun, plural doo·hick·eys. Informal.
  1. a gadget; dingus; thingumbob.
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Origin of doohickey

An Americanism dating back to 1910–15; doo(dad) + hickey
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for doohickey

doohickey

noun
  1. US and Canadian informal another name for doodah (def. 1)
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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

Word Origin and History for doohickey

n.

also doohicky, a name for something one doesn't know the name of, 1914, American English, arbitrary formation.

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Online Etymology Dictionary, © 2010 Douglas Harper