patina

From Wiktionary
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Pronunciation[change]

  • (UK) IPA (key): /ˈpætɪnə/
  • (US) IPA (key): /pəˈtiː.nə/ or /ˈpæ.tɪ.nə/

Noun[change]

Singular
patina

Plural
patinas

  1. (chemistry) Patina is a coating of various chemical compounds such as oxides or carbonates formed on the surface of metal during exposure to weathering.