| nutrient-rich organic materials obtained from wastewater treatment and used beneficially, as for fertilizer: The application of biosolids to land improves soil properties and plant productivity, and reduces dependence on inorganic fertilizers. |
bi·o·sol·ids  (bī'ō-sŏl'ĭdz) pl.n. Solid or semisolid material obtained from treated wastewater, often used as fertilizer. |
oʊˌsɒl