Where does “tinfoil hat” come from?

tinfoil hat (English) comes from English tinfoil, from English FOIL, from Middle English foilen, from Old French fouler, from Latin fullo, from Proto-Indo-European bʰleh₃-, from Proto-Indo-European bʰel-, from Proto-Indo-European bʰōl-.

tinfoil hat (English): A piece of headgear made from one or more sheets...

Definitions

  1. A piece of headgear made from one or more sheets...

Ancestry of “tinfoil hat”, step by step

tinfoil hat traces back through two separate lines of ancestry.

via English tinfoil

StepLanguageWordMeaning
1EnglishtinfoilA thin, pliable sheet of tin or an alloy of tin...
2EnglishFOILTo apply the FOIL algorithm to
3Middle Englishfoilenspoil a scent trail by crossing it
4Old Frenchfoulerto tread, to stamp, to full; tread on, trample
5Latinfullofuller
6Proto-Indo-Europeanbʰleh₃-bloom, flower
7Proto-Indo-Europeanbʰel-to sound; to speak, roar, bark; shiny, white; to...
8Proto-Indo-Europeanbʰōl-

via English hat

StepLanguageWordMeaning
1EnglishhatA covering for the head, often in the approximate...
2Middle EnglishhatA hat or cap; a piece of headgear or headwear; A...
3Old EnglishhætAlternative form of hætt; head-covering, hat
4Proto-Germanichattuzhat
5Proto-Indo-Europeankadʰ-to guard, cover, protect, care for; to guard,...

Words derived from “tinfoil hat

Every word from Proto-Indo-European bʰōl-Every word from Proto-Indo-European bʰel-Every word from Proto-Indo-European bʰleh₃-