Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
blank [blæŋk] adj (paper) чи́стый*чист (look) безуча́стный*безуча́стен
n (of memory) пробе́л; (on form) про́пуск; (for gun) холосто́й патро́н
we drew a blank (fig) мы оста́лись ни с чем
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.