Collins Concise English Dictionary © HarperCollins Publishers::

Tetragrammaton /ˌtɛtrəˈɡræmətən/ n
  1. the Hebrew name for God revealed to Moses on Mount Sinai (Exodus 3), consisting of the four consonants Y H V H (or Y H W H) and regarded by Jews as too sacred to be pronounced. It is usually transliterated as Jehovah or Yahweh
    Sometimes shortened to: Tetragram
Etymology: 14th Century: from Greek, from tetragrammatos having four letters, from tetra- + gramma letter

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