demi-lune

/D EH1 M IY0 L UW0 N/
noun
  1. 1

    A fortification constructed beyond the main ditch of a fortress, and in front of the curtain between two bastions, intended to defend the curtain; a ravelin.

  2. 2

    A crescentic mass of granular protoplasm present in the salivary glands.

Source: https://en.wiktionary.org/wiki/demi-lune, https://en.wiktionary.org/wiki/demilune