Answer: OSMUND

AnswerCrossword Clue
OSMUND11th-century saint
OSMUNDHigh-quality iron
OSMUNDSuperior iron from Sweden.
OSMUNDRoyal fern
osmundsuperior quality of iron, formerly used for fishhooks, arrowheads, etc.
osmundany of a genus of large ferns, also OSMUNDA
osmundany fern of the genus Osmunda, esp. the royal fern