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Meaning of surbased

sur•based

Pronunciation: (sûr'bāst"), [key]
— adj. Archit.
  1. having a surbase.
  2. depressed; flattened.
  3. (of an arch) having a rise of less than half the span.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.