• Webster's Revised Unabridged Dictionary
    • n Ironheads (Bot) A European composite herb (Centaurea nigra); -- so called from the resemblance of its knobbed head to an iron ball fixed on a long handle.
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Century Dictionary and Cyclopedia
    • n ironheads The knapweed, Centaurea nigra: so called in reference to the knobbed involucres.
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In literature:

My responsibility then, compared to yours now, will be as a grain of sand to Old Ironhead up yonder.
"Wolf Breed" by Jackson Gregory
You are no doubt from Ironhead's country?
"From Pole to Pole" by Sven Anders Hedin