Webster's English Dictionary

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tetragrammaton

Cross references:
  1. yahweh                
 
tet.ra.gram.ma.ton \.te-tr*-'gram-*-.ta:n\ n [ME, fr. Gk, fr. neut. of 
   tetragrammatos having four letters, fr. tetr]a- + grammat-, gramma letter - 
   more at GRAM : the four Hebrew letters usu. transliterated Yhwh or Jhvh 
   that form a bib lical proper name of God