Wiktionary
lost wax
n. A method of casting a sculpture in which a model of the sculpture is made from wax; the model is used to make a mould; when the mould has set, the wax is made to melt and is poured away, leaving the mould ready to be used to cast the sculpture.
Usage examples of "lost wax".
A method common throughout the ancient world is casting by the lost wax method (cire perdue).
Perhaps this is the repository for all the wax ever lost through the 'lost wax' method of casting metal.
Blaise used the lost wax method of jewelry-making, which meant that she carved out her pieces in stiff blue wax before casting them in silver or copper or gold.