tin hat

== English == === Alternative forms === tinhat === Noun === tin hat (plural tin hats) (military, slang, historical) The steel helmet worn by soldiers during World War I. [from 1915] Synonym: trench derby (slang) A tinfoil hat. === References === “tin hat”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022. === Anagrams === Tanith, in that