Any of several fairy wrens (family Maluridae) with males that are predominantly blue in colour; especially the superb fairy wren, Malurus cyaneus, and the splendid fairy wren, M. splendens.
Origin
Mid 19th century.
Definition of blue wren in US English:
blue wren
noun
Australian
Any of several fairy wrens (family Maluridae) with males that are predominantly blue in colour; especially the superb fairy wren, Malurus cyaneus, and the splendid fairy wren, M. splendens.