One of the mysteries of the English language finally explained.
1Of a tool, weapon, or other object: having an iron head; tipped with iron.
2Designating King Charles XII of Sweden (1682–1718).
3Hard-headed, determined, unwavering; stubborn, obstinate.
Late 16th century; earliest use found in Edmund Spenser (?1552–1599), poet and administrator in Ireland. From iron + headed.
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