Home › Words › S › superphosphatesuperphosphatesuperphosphate means A fertilizer produced by the action of concentrated sulfuric acid on powdered phosphate rock.Among words judged in Lexicurio's Arena, superphosphate ranks #37,340 of 42,762 for Qualifying.EtymologyFrom super- + phosphate.nounA fertilizer produced by the action of concentrated sulfuric acid on powdered phosphate rock.A phosphate containing the greatest amount of phosphoric acid that can combine with the base.Definitions & examples from Wiktionary (CC BY-SA 3.0).