undercooled

/ˌʌndərˈkuːld/
adjective
  1. Cooled to a temperature below the freezing point without becoming solid; supercooled.
    • In the lab, they studied the properties of undercooled metals.
    • The undercooled liquid suddenly crystallized when shaken.
    • The undercooled water remained liquid even at -10°C.
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