From mdw(“word”) + nṯr(“god”) in a direct genitive construction, thus literally ‘the god’s word’. The written form demonstrates honorific transposition.
“mdw-nṯr (lemma ID 78190)”, in Thesaurus Linguae Aegyptiae[1], Corpus issue 18, Web app version 2.1.5, Tonio Sebastian Richter & Daniel A. Werning by order of the Berlin-Brandenburgische Akademie der Wissenschaften and Hans-Werner Fischer-Elfert & Peter Dils by order of the Sächsische Akademie der Wissenschaften zu Leipzig, 2004–26 July 2023