The day after tomorrow should be thremorrow
@dbergey GILES : passing by and seen this ( but can't find it on my stream so replying here ) . In Italian there IS such a word, they day after "tomorrow" ( i.e. "domani" ) is called "dopodomani" ( i.e. "aftertomorrow" ) so there's that
@dbergey in Welsh this is trennydd.