Osculum Quotes

Speaking about pax in the proto-Christan epoch turned out to be a delicate matter, because around the year 300 pax became a key word in the Christian liturgy. It became the euphemism for a mouth-to-mouth kiss among the faithful attending services; pax became the camouflage for the osculum (from os, mouth), or the conspiratio, a commingling of breaths. (Ivan Illich)
In the Christian liturgy of the first century, the osculum assumed a new function. It became one of two high points in the celebration of the Eucharist. View quote
Ivan Illich
The Latin osculum is neither very old nor frequent. It is one of three words that can be translated by the English, "kiss." View quote
Ivan Illich