Definition of moon flask in English:

moon flask

noun

historical
  • A type of ceramic bottle with a flattened circular body and rounded handles on either side of the neck, made in China from the 15th cent.

Origin

1970s; earliest use found in The Times. After Chinese bàoyuè píng, lit. ‘moon-embracing flask’ or bǎoyuè píng, lit. ‘precious moon flask’.