Pronunciation: (OO'län, yOO'lun), [key]
1. one of a group of lancers in a light-cavalry unit, first appearing in Europe in the Polish army.
2. one of such a group as later developed into heavy cavalry in western European armies, esp. in Germany. Also,ulan.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.