1. anything that encircles the head, for defence or ornament:

2. the brim of the helmet, projecting behind as well as before, (Iliad by Homer)

3. part of a woman's head-dress, a diadem, coronal , (Iliad by Homer), etc.:—;metaphorically, of a city, ἀπὸ στεφάναν κέκαρσαι πύργων thou hast been shorn of thy coronal of towers, (Euripides)

4. the brim or edge of anything, the brow of a hill, edge of a cliff , (Iliad by Homer); of a basket, (Moschus Bucolicus) (ML)