Demilune
Demilune , noun
[French demi- lune.]
1.
(Fortification) A work constructed beyond the main ditch of a fortress, and in front of the curtain between two bastions, intended to defend the curtain; a ravelin. See Ravelin.
2.
(Physiology) A crescentic mass of granular protoplasm present in the salivary glands.
Each crescent is made of polyhedral cells which under some circumstances are supposed to give rise to new salivary cells.