One of the perhaps strangest words that we often use as Catholics is “Eucharist.” It might not even be obvious how to pronounce it if you haven’t heard it before (YOO-ka-rist). Once you master that you can try the Spanish version: Eucaristía (a hint, it has six syllables!).
In itself, it is a Greek word meaning “thanksgiving.” It was used in the early Church, though, to give name to the celebration surrounding the sacrament of the Last Supper (for example, in the excellent accounts given by St Justin Martyr). From there it developed a number of related uses. So, “the Eucharist” may refer to the bread and wine that has become the Body and Blood of Christ. In this case it would be similar to the words “Holy Communion,” “the Most Holy Sacrament,” or the Host/Chalice. Additionally, “celebrating the Eucharist” may be used as an equivalent of Mass, referring to the whole ceremony that is carried out in church. It might seem odd to refer to the consecrated Host as “the Eucharist” (ie “the Thanksgiving”), but it flows from remembering the spirit of thanks that should surround this sacramental gift. Our prayer is often filled with expressions of “please” and “I’m sorry.” Let this word be a reminder to also fill them with the words “thank you!”