Eucharist
noun
Eu·cha·rist ˈyü-k(ə-)rəst 
1
: communion sense 2a
2
Christian Science : spiritual communion with God
eucharistic
ˌyü-kə-ˈri-stik
adjective often capitalized 
Word History
Etymology
Middle English eukarist, from Anglo-French eukariste, from Late Latin eucharistia, from Greek, Eucharist, gratitude, from eucharistos grateful, from eu- + charizesthai to show favor, from charis favor, grace, gratitude; akin to Greek chairein to rejoice — more at yearn
First Known Use
14th century, in the meaning defined at sense 1