II. What is This Sacrament Called?

From The Catechism of the Catholic Church

1330
The memorial of the Lord’s Passion and Resurrection.
The Holy Sacrifice, because it makes present the one sacrifice of Christ the
Savior and includes the Church’s offering. the terms holy sacrifice of the
Mass, “sacrifice of praise,” spiritual sacrifice, pure and holy
sacrifice are also used,¹⁴⁸ since it completes and surpasses all the
sacrifices of the Old Covenant.
The Holy and Divine Liturgy, because the Church’s whole liturgy finds its
center and most intense expression in the celebration of this sacrament; in the
same sense we also call its celebration the Sacred Mysteries. We speak of the
Most Blessed Sacrament because it is the Sacrament of sacraments. the
Eucharistic species reserved in the tabernacle are designated by this same
name.

PART TWO: THE CELEBRATION OF THE CHRISTIAN MYSTERY

SECTION TWO THE SEVEN SACRAMENTS OF THE CHURCH
- CHAPTER ONE THE SACRAMENTS OF CHRISTIAN INITIATION
  - Article 3 THE SACRAMENT OF THE EUCHARIST
    - II. What is This Sacrament Called?

From The Catechism of the Catholic Church – rosary.team