solum
so.lum \'so--l*m\ \-l*\ n or so.la or solums [NL, fr. L, ground, soil] pl : the altered layer of soil above the parent material that includes the A- and B-horizons
so.lum \'so--l*m\ \-l*\ n or so.la or solums [NL, fr. L, ground, soil] pl : the altered layer of soil above the parent material that includes the A- and B-horizons