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sodium ammonium phosphate

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noun Chemistry.
  1. a colorless, odorless, crystalline, water-soluble solid, NaNH4HPO4⋅4H2O, originally obtained from human urine: used as a blowpipe flux in testing metallic oxides.
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Also called microcosmic salt, salt of phosphorus.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018