What Does “Eucharist” Mean in the Bible?
The sacrament of the Body and Blood of Jesus. The word means “thanksgiving.”
Today
It is the Mass, and also the consecrated Host we receive at Communion.
Where it appears in the Bible
Luke 22:19-20
What the Bible says
Luke 22:19-20
19And taking bread, he gave thanks, and brake; and gave to them, saying: This is my body, which is given for you. Do this for a commemoration of me. 20In like manner the chalice also, after he had supped, saying: This is the chalice, the new testament in my blood, which shall be shed for you.
Douay-Rheims Bible (Challoner revision), public domain.
Source: Catechism 1324 and 1328