[bahy-fen-l, -feen-l]
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.

Origin of biphenyl

First recorded in 1920–25; bi-1 + phenyl
Also called diphenyl, phenylbenzene. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for biphenyl


  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
Also called: diphenyl
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

biphenyl in Medicine


[bī-fĕnəl, -fēnəl]
  1. A colorless crystalline aromatic hydrocarbon used in fungicides and in organic synthesis.diphenyl
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.