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bi +‎ -dar, after the pattern of gaydar.


bidar (plural bidars)

  1. (slang) The ability to detect whether or not a person is bisexual by observing that person.
    • 1999 October 22, Kay Dekker, “Re: crush server redux”, in, Usenet[1]:
      Though I _think_ he's straight: but then my bidar isn't always running at 100%.
    • 2006, Nicole Krista & Mike Szymanski, The Bisexual's Guide to the Universe: Quips, Tips, and Lists for Those Who Go Both Ways, Alyson Books (2006), →ISBN, page 131:
      Bi people hang in straight places a lot, and given that you are also bi, they will probably stand out to you in an indescribable, nonverbal way. And that, my friend, is bidar.
    • 2013, Shiri Eisner, Bi: Notes for a Bisexual Revolution, Seal Press (2013), →ISBN, unnumbered page:
      Of course, not all bisexuals are recognizable, and many will easily defy the bidar, whereas others will appear to be bisexuals without actually identifying as bi.
    • For more examples of usage of this term, see Citations:bidar.





From Middle High German wider, from Old High German widar (against).



  1. (Sette Comuni) against
    bor un bidarfor and against


  • “bidar” in Martalar, Umberto Martello; Bellotto, Alfonso (1974) Dizionario della lingua Cimbra dei Sette Communi vicentini, 1st edition, Roana, Italy: Instituto di Cultura Cimbra A. Dal Pozzo