demilune
noun
demi·lune
| \ ˈdem-ē-ˌlün
\
\
Medical Definition of demilune
: one of the small crescentic groups of granular deeply staining zymogen-secreting cells lying between the clearer mucus-producing cells and the basement membrane in the alveoli of mixed salivary glands
— called also crescent of Giannuzzi