Tetragrammaton[te′trə gram′ə tän′]
the four consonants of the ancient Hebrew name for God (variously transliterated JHVH, IHVH, JHWH, YHVH, YHWH), that was considered too sacred to be spoken aloud: the word Adonai (Lord) is substituted for this name in utterance, and the vowels of Adonai or Elohim (God) are inserted in Hebrew texts, so that the modern reconstructions are Yahweh, Jehovah, etc.
Origin of TetragrammatonMiddle English ; from Classical Greek tetragrammaton ; from tetra-, four + gramma, a letter: see gram
The four Hebrew letters usually transliterated as YHWH or JHVH, used as a biblical proper name for God.
Origin of TetragrammatonMiddle English Tetragramaton, from Greek tetragrammaton, four-letter word, from neuter of tetragrammatos, four-lettered : tetra-, tetra- + gramma, grammat-, letter; see gerbh- in Indo-European roots.