WordReference Random House Unabridged Dictionary of American English © 2017
Tet•ra•gram•ma•ton  (te′trə gramə ton′),USA pronunciation n. 
  1. Judaismthe Hebrew word for God, consisting of the four letters yod, he, vav, and he, transliterated consonantally usually as YHVH, now pronounced as Adonai or Elohim in substitution for the original pronunciation forbidden since the 2nd or 3rd centuryb.c. Cf.  Yahweh. 
  • Greek tetragrámmaton, noun, nominal use of neuter of tetragrámmatos having four letters, equivalent. to tetra- tetra- + grammat- (stem of grámma) letter + -os adjective, adjectival suffix
  • Middle English 1350–1400

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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