tau /ˈtaʊ, ˈtɔ/
  希臘字母第19字
  tau /ˈtaʊ, ˈtɔ/ 名詞
  Tau n.  The nineteenth letter (
  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.
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  tau
       n : the 19th letter of the Greek alphabet