Western Isles /ˈwɛstənˈaɪ̯lz/ noun2 •The Outer Hebrides, an archipelago of the Hebrides in Scotland.Captain: The multiplying villainies of nature / Do swarm upon him - from the Western Isles. — 1606 •A council area of Scotland, one of 32 created in 1996, the Western Isles Council (officially Scottish Gaelic Comhairle nan Eilean Siar since 1997).