tetragram

noun
tet·​ra·​gram | \ˈte‧trəˌgram, -raa(ə)m\

Definition of tetragram 

: a word of four letters : tetragrammation

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History and Etymology for tetragram

Middle Greek tetragrammon, from neuter of Late Greek tetragrammos having four letters, from Greek tetra- + -grammos (from gramma letter)

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