D2R1U1S1E1
6 points
DRUSE is validvalid
a crust of small crystals lining a rock cavity [n DRUSES]
a crust of small crystals lining a rock cavity [n DRUSEN or DRUSES]
a crust of small crystals lining a rock cavity [n DRUSES]
a crust of small crystals lining a rock cavity [n DRUSEN or DRUSES]