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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Tau n.  Zool. The common American toadfish; -- so called from a marking resembling the Greek letter tau (τ).
 Tau cross. See Illust. 6, of Cross.
 

From: WordNet (r) 2.0

 tau cross
      n : cross resembling the Greek letter tau [syn: St. Anthony's
          cross]