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Meaning of gumbotil

gum•bo•til

Pronunciation: (gum'bu-til), [key]
— n. Geol.
  1. a sticky clay formed by the thorough weathering of glacial drift, the thickness of the clay furnishing means for comparing relative lengths of interglacial ages.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.