Where does “thirteenfold” come from?
thirteenfold (English) comes from English thirteen, from Middle English thirttene, from Old English þrēotīene, from Proto-Germanic þritehun, from Proto-Germanic tehun, from Proto-Indo-European déḱm̥t — ten.
thirteenfold (English): By a factor of thirteen
Ancestry of “thirteenfold”, step by step