noun, verb, slang ·Moderate ·College level

Definitions

Noun

1. 1
   A thin, pliable sheet of tin or an alloy of tin and lead, used as a protective wrapping. countable, uncountable
2. 2
   foil made of tin or an alloy of tin and lead wordnet
3. 3
   Aluminium foil. countable, informal, uncountable

Verb

1. 1
   To cover in tinfoil. transitive

Synonyms

All synonyms

aluminium foilaluminium foilchaffmetaltin foilwindow

Example

More examples

"Tom wears a tinfoil hat to protect his brain from harmful radiation."

Etymology

From tin + foil.

Related phrases

tinfoil hataluminium foiltin can

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.