See Also: lapillus(dictionary)

lapillus (iou)



lapillus noun. . M18.
[Latin, dim. of lapis stone; in pl. also from Italian lapilli, pl. of lapillo.]
Orig., a small stone or pebble. Now (Geology), a fragment of rock or lava ejected from a volcano, spec. one between 2 and 64 mm in size. Usu. in pl.