ˈkəpfəˌrän, ˈk(y)üp- noun
( -s )
Etymology: International Scientific Vocabulary cup ric + ferr ic + -on
: a colorless crystalline salt C 6 H 5 N(NO)ONH 4 that is a precipitant for copper and iron from solutions and is used also in the analysis of other metals especially of the uranium group : the ammonium salt of N -nitroso- N -phenyl-hydroxylamine