1. In the blade, an extrados profile (80) at the surface of the platform (60) and along the extrados (58) has a first recessed part (F) situated axially in an upstream half of the aerofoil (50) and a first boss-like part (G) situated axially downstream of the said first recessed part.

2. Archivolt An architrave modified by being carried around a curved opening instead of a rectangular one; an ornamental molding or band of moldings on the face of an arch following the contour of the extrados.