Sacramental wine was wine used for religious purposes. Both Greek mythology and Christianity shared the concept of sacramental wine.
In 2267, drinking the sacramental wine was among the activities Apollo proclaimed would occur among a landing party from USS Enterprise and himself. (TOS: "Who Mourns for Adonais?")
In 2376, listening to "Father Mulligan" (The Doctor) prattle on about photons and force fields, Grace Declan suggested he might have been imbibing the sacramental wine. (VOY: "Spirit Folk")