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tin hat

noun Slang.
  1. a steel helmet worn by soldiers.
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Origin of tin hat

First recorded in 1915–20
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for tin hat

tin hat

noun
  1. obsolete, informal a steel helmet worn by military personnel for protection against small metal fragments
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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