Tetragrammaton
Concise Oxford English Dictionary © 2008 Oxford University Press:
Tetragrammaton /ˌtɛtrəˈgramətɒn/
▶noun the Hebrew name of God transliterated in four letters as YHWH or JHVH and articulated as Yahweh or Jehovah.
– origin Gk, neut. of tetragrammatos ‘having four letters’.
'Tetragrammaton' also found in these Oxford entries:

