1. a hollow way, defile, glen , (Homeric Hymns)

2. a canal, aqueduct, trench , (Herdotus Historicus)

3. a channel, strait , (Aeschulus Tragicus); αὐλῶνες πόντιοι the sea straits , i. e. the Archipelago, (Sophocles Tragicus) (ML)