liquidus 

https://doi.org/10.1351/goldbook.L03590
A line on a binary phase diagram (or surface on a ternary phase diagram) that indicates the temperature at which solidification begins on cooling or at which melting is completed on heating under equilibrium conditions.
Source:
PAC, 1994, 66, 577. (Definitions of terms relating to phase transitions of the solid state (IUPAC Recommendations 1994)) on page 585 [Terms] [Paper]
Citation: 'liquidus' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.L03590 RIS BibTex EndNote
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Last revised: February 24, 2014