undercool

[ uhn-der-kool ]
/ ˌʌn dərˈkul /

verb (used with object)

Chemistry.
  1. to cool less than necessary for a given process or purpose.
  2. to supercool.
Metallurgy. to cool (molten metal) without forming crystals to a temperature below that at which crystallization normally takes place: Metal must be absolutely still to be undercooled.

Origin of undercool

First recorded in 1900–05; under- + cool

British Dictionary definitions for undercool

undercool
/ (ˌʌndəˈkuːl) /

verb

a less common word for supercool