diammonium phosphate

noun
di·​am·​mo·​ni·​um phosphate | \ˌdī-ə-ˈmō-nē-əm- \

Definition of diammonium phosphate 

: a white crystalline compound (NH4)2HPO4 used especially as a fertilizer and as a fire retardant

First Known Use of diammonium phosphate

circa 1929, in the meaning defined above

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The first known use of diammonium phosphate was circa 1929

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