noun Chemistry.

  1. a water-insoluble, pleasant-smelling, colorless powder or white scales, C12H10, composed of two phenyl groups, from which benzidine dyes are derived: used chiefly as a heat-transfer agent and in organic synthesis.


  1. a white or colourless crystalline solid used as a heat-transfer agent, as a fungicide, as an antifungal food preservative (E230) on the skins of citrus fruit, and in the manufacture of dyes, etc. Formula: C 6 H 5 C 6 H 5
  2. any substituted derivative of biphenyl


  1. A colorless crystalline aromatic hydrocarbon used in fungicides and in organic synthesis.diphenyl

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