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su·per·cool / ˌsoōpərˈkoōl/ • v. [tr.] Chem. cool (a liquid) below its freezing point without solidification or crystallization. ∎  [intr.] Biol. (of a living organism) survive body temperatures below the freezing point of water. • adj. inf. extremely attractive, impressive, or calm: the supercool tracks in this collection.