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The Collaborative International Dictionary
Volcanic neck

Volcanic neck \Vol*can"ic neck\ (Geol.) A column of igneous rock formed by congelation of lava in the conduit of a volcano and later exposed by the removal of surrounding rocks.

Wikipedia
Volcanic neck
  1. Redirect Volcanic plug

Usage examples of "volcanic neck".

Ahead loomed a jut of rock: an ancient volcanic neck, so Reith surmised.

It's an old volcanic neck, it's the grand-daddy of all diamond mines.

Clouds drifted across the sky, almost scraping a cluster of crags, the remnants of an ancient volcanic neck.