Definition of tetragram in English:

tetragram

noun

  • A word consisting of four letters or characters.

    • ‘But around 300 BC, still worried about taking God's name in vain, they began even substituting these tetragrams with the word, Adhonai, which simply means Lord.’
    • ‘Yes, the latest issue of WordWays, the oddest journal on the planet, announces that computer-aided searches of the OED have found 523 of the 625 vowel tetragrams.’

Pronunciation:

tetragram

/ˈtɛtrəɡram/