from a derivative of G2378; a place of sacrifice, i.e. an altar (special or genitive case, literal or figurative):--altar.
the altar for slaying and burning of victims used of
the altar of whole burnt offerings which stood in the court of the priests in the temple at Jerusalem
the altar of incense which stood in the sanctuary or the Holy Place
any other altar
metaph., the cross on which Christ suffered an expiatory death: to eat of this altar i.e. to appropriate to one's self the fruits of Christ's expiatory death