medīdiēs (Latin) comes from Latin diēs, from Proto-Italic djēm, from Proto-Italic *djous, from Proto-Indo-European dyḗws, from Proto-Indo-European dyéws, from Proto-Indo-European dyew- — to be bright; sky, heaven.
Ancestry of “medīdiēs”, step by step
medīdiēs traces back through two separate lines of ancestry.