ἀγκών

1. the bend of the arm, the elbow , (Homer)

2. generally the arm , like ἀγκάλη, (Pindar)

3. any bend , as the jutting angle of a wall, (Iliad by Homer): the bend or reach of a river, (Herdotus Historicus); ἕσπεροι ἄγκωνες, in (Sophocles Tragicus), seem to be the angle of the bay of Rhoeteium. (ML)