ear

Crossette \Cros*sette"\ (kr?s-s?t`), n. [F., dim. of crosse. See {Crosier}.] (Arch.) (a) A return in one of the corners of the architrave of a door or window; -- called also {ancon}, {ear}, {elbow}. (b) The shoulder of a joggled keystone. [1913 Webster]