noun
the Lord's Supper; the Last Supper
Christian term referring to the final meal Jesus shared with his disciples, commemorated in the Eucharist.
教会で主の晩餐にあずかる。
I partake in the Lord's Supper at church.
聖餐 is a more general term for the Eucharist or Holy Communion, while 主の晩餐 specifically refers to the Last Supper event.
From 主 (しゅ, 'Lord') + の (possessive particle) + 晩餐 (ばんさん, 'dinner, supper'). A direct translation of the Christian term 'the Lord's Supper'.