What does "custard" mean?

Custard: A mixture of milk and eggs, sweetened, and baked or boiled. Custard apple (Bot.), a low tree or shrub of tropical America, including several species of Anona (A. squamosa, reticulata, etc.), having a roundish or ovate fruit the size of a small orange, containing a soft, yellowish, edible pulp. -- Custard coffin, pastry, or crust, which covers or coffins a custard [Obs.] Shak.