demilune

adj

1. (not-comparable)In the shape of a half-moon, i.e. semicircular.

   “A handsome pair of tall, walnut-veneered Biedermeier bookcases from Austria, circa 1835, can be had from Iliad Antik of New York for $95,000, while Clinton Howell of New York has a rare pair of marquetry inlaid demilune consoles that he attributes to the workshop of John Linnell of England, circa 1755.”

noun

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