Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An exposed, oxidized portion of a mineral vein, especially a rust-colored outcrop of iron ore.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. decomposed rock, usually reddish or ferruginous (owing to oxidized pyrites), forming the upper part of a metallic vein

from the GNU version of the Collaborative International Dictionary of English

  • n. Decomposed rock, usually reddish or ferruginous (owing to oxidized pyrites), forming the upper part of a metallic vein. Called also iron hat.

from The Century Dictionary and Cyclopedia

  • n. In mining, the ferruginous quartzose material which often forms a large part of the outcrop of a lode in which the metallic contents at depths exist chiefly in the form of sulphids, among which pyrites, a combination of sulphur and iron, is rarely wanting, and is often present in large quantity.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

Cornish gossen, from gōs, blood, from Old Cornish guit.

Examples

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