Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

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

from The Century Dictionary.

  • noun 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.

from the GNU version of the Collaborative International Dictionary of English.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

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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