Definition of tetragrammaton
: the four Hebrew letters usually transliterated YHWH or JHVH that form a biblical proper name of God — compare yahweh
Origin and Etymology of tetragrammaton
Middle English, from Late Latin, from Greek, from neuter of tetragrammatos having four letters, from tetra- + grammat-, gramma letter — more at gram
First Known Use: 15th century
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