Etymology of the Latin word epithalamium
the Latin word epithalamium (nuptial song)
derived from the Greek word epithalamion
derived from the Greek word epithalamios, ἐπιθαλάμιος
derived from the Greek word thalamos, θάλαμος, ϑάλαμος (chamber; chamber, couch; chamber)
using the Greek prefix epi-, ἐπι-
derived from the Byzantine Greek word epi, ἐπί (upon; properly, meaning superimposition (of time, place, order, etc.), as a relation of distribution (with the genitive case); over, upon, etc.; of rest (with the dative case) at, on, etc.; of direction (with the accusative case) towards, upon, etc.)