cross·ette \(ˈ)krȯ|set\noun (-s) Etymology: French crossette, diminutive of crosse crosier (pastoral staff) — more at crosier 1.: a projection at a corner of the architrave of a door or window — called also ancon, ear, elbow 2.: a projection in a voussoir (as of a flat arch) fitting into a corresponding recess in the adjacent voussoir