Definition of iron mask in English:

iron mask

noun

  • 1A mask made of iron, especially one worn for protection or as a punishment.

  • 2figurative Something, especially an outward appearance or expression, which hides a person's true identity or nature.

Origin

Mid 18th century; earliest use found in Voltaire's Age of Lewis XIV. From iron + mask, after French masque de fer.

Pronunciation

iron mask

/ʌɪən ˈmɑːsk/ /ʌɪən ˈmask/