Definitions

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

  • noun The main vein of ore in a region.
  • noun An abundant or rich source.

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

  • noun geology A large or rich vein of gold or of another precious mineral from which other branches extend.
  • noun idiomatic, by extension Any source of valuable or useful material.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun the main vein of ore in a deposit

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

Probably from Spanish veta madre ("mother lode")

Examples

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