orillon
/ɒrɪˈjɒ̃/(also orillion) Fortification. Now historical
noun
A projecting tower or shoulder at the corner of a bastion, between the face and a flank, used to defend the flank.
Origin
Mid 17th century; earliest use found in Charles Cotterell (1615–1701), courtier and translator. From Middle French, French oreillon, orillon from oreille ear + -on.