Definitions

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

  • noun An area or formation of older rocks completely surrounded by younger layers.

from The Century Dictionary.

  • noun In geology, a part of one formation completely surrounded by another that rests upon it: opposed to outlier.

Etymologies

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

[in + (out)lier.]

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