Meaning of ventifact

ven•ti•fact

Pronunciation: (ven'tu-fakt"), [key]
— n. Geol.
  1. a pebble or cobble that has been faceted, grooved, and polished by the erosive action of wind-driven sand.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.