crux de·cus·sa·ta \-ˌdekəˈsād.ə, -äd.ə\noun (pluralcruces decussatae \-āˌtē, -äˌtī\) Etymology: New Latin, literally, decussate cross 1.: a supposed variety of the cross of crucifixion consisting of two intersecting beams set up in the form of an X : a decussate cross — compare crux commissa, crux immissa 2.: saint andrew's cross