supercooling

synonym: undercooling
https://doi.org/10.1351/goldbook.14273
The process of cooling a melt to a temperature below its equilibrium melting point, without crystallization occurring.
Source:
PAC, 2011, 83, 1831. (Definitions of terms relating to crystalline polymers (IUPAC Recommendations 2011)) on page 1866 [Terms] [Paper]