mooncake /ˈmuːnkeɪk/ noun1 •A rich, dense Chinese pastry traditionally filled with lotus seed paste and nowadays with a variety of other fillings, usually eaten during the Mid-Autumn Festival (on the 15th day of the eighth month of the Chinese lunisolar calendar; early September to early October).Mei-kwei 玫丨 [i.e., 玫瑰] name of a pearl; also of a round cake, called the moon-cake, eaten at the harvest moon; […] — 1819 formsmooncakes