Tau Definition
 tou, tô 
    noun
  
 The nineteenth letter of the Greek alphabet (Τ, τ)
 Webster's New World 
A Τ-shaped sign or structure; a St. Anthony's cross, sometimes considered as a sacred symbol.
 Wiktionary 
(physics, dated) A tau meson, now usually known as a kaon.
Wiktionary 
(biology) A type of protein used to stabilise microtubules.
Wiktionary 
Other Word Forms of Tau
Noun
Singular:
 tauPlural:
 tausOrigin of Tau
-  
Greek of Phoenician origin tww in Semitic roots
From American Heritage Dictionary of the English Language, 5th Edition
 From Ancient Greek ταῦ (tau).
From Wiktionary
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