n.
Pronunciation: ˌ te-tr ə - ' gra-m ə - ˌ tän
Function: noun
Etymology: Middle English, from Late Latin, from Greek, from neuter of tetragrammatos having four letters, from tetra- + grammat-, gramma letter ― more at GRAM
Date: 15th century
: the four Hebrew letters usually transliterated YHWH or JHVH that form a biblical proper name of God ― compare YAHWEH