postmeridian

Etymology tree
Proto-Indo-European *pós
Proto-Indo-European *-ti
Proto-Indo-European *pósti
Proto-Italic *posti
Old Latin poste
Latin post
English post-
Proto-Indo-European *me
Proto-Indo-European *dʰeh₁-?
Proto-Indo-European *-dʰe
Proto-Indo-European *médʰi
Proto-Indo-European *-os
Proto-Indo-European *médʰyos
Proto-Italic *meðjos
Latin medius
Proto-Indo-European *dyew-
Proto-Indo-European *-s
Proto-Indo-European *dyḗws
Proto-Italic *djous
Latin diēs
Latin medīdiēs
Latin merīdiēs
Proto-Indo-European *-nós
Proto-Italic *-nos
Latin -nus
Latin -ānus
Latin merīdiānusder.
Middle English meridian
English meridian
English postmeridian
From post- + meridian.