New Catholic Dictionary illustration of a luna, open and closedAlso known as

  • lunula
  • lunette


  • Latin: moon or little moon


A circular receptacle, usually with glass sides, inserted into an ostensorium, to show the Sacred Host. It is blessed by a priest, and therefore is a sacred vessel.

MLA Citation

  • “luna“. CatholicSaints.Info. 30 August 2018. Web. 29 November 2020. <>