Akademik
gravel
1.
noun
a)
Small fragments of
rock
, used for laying on the beds of roads and railroads, and
as
ballast
.
b)
A type or grade of small rocks, differentiated by mineral type, size range, or other characteristics.
2.
verb
a)
To
apply
a
layer
of gravel to the
surface
of a road, etc.
b)
To
puzzle
or
annoy
Wikipedia foundation
.