(on a graph of temperature versus composition) the curve connecting the temperatures at which a liquid solution is in equilibrium with its vapor and with the solid solution.
In a ternary system the locus of all points on the liquidus of constant temperature.
liquidus in Science
liquidus
(lĭk'wĭ-dəs) The minimum temperature at which all components of a mixture (such as an alloy) can be in a liquid state. Below the liquidus the mixture will be partly or entirely solid. See illustration at eutectic. Compare solidus.