(τὸ ποτήριον τῆς εὐλογίας, tó potḗrion tḗs eulogías, “the consecrated cup,” 1 Corinthians 10:16):
A technical term from the Jewish liturgy transferred to the Lord’s Supper, and signifying the cup of wine upon which a blessing was pronounced. The suggestion that it carries with it a higher significance, as a cup that brings blessing, is not without force. The succeeding words, “we bless,” are equivalent to “for which we give thanks.” It was consecrated by thanksgiving and prayer.
See also Cup.
