An impure form of gypsum, contaminated mainly with phosphate, which is a by-product of the industrial production of orthophosphoric acid from phosphate rock.
Origin
1950s.
Definition of phosphogypsum in US English:
phosphogypsum
noun
An impure form of gypsum, contaminated mainly with phosphate, which is a by-product of the industrial production of orthophosphoric acid from phosphate rock.