'ancon' definitions:
- 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]
