Definition of abrasives:
(adj) :
Producing abrasion; rough enough to wear away the outer surface.
(adj) :
Being rough and coarse in manner or disposition; overly aggressive and causing irritation.
(n) :
A hard inorganic substance or material consisting in powder or granule form such as sandpaper, pumice, or emery, used for cleaning, smoothing, or polishing.
(n) :
(geology) Rock fragments, sand grains, mineral particles, used by water, wind, and ice to abrade a land surface.