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Tom Fitzgerald wrote:

Hi, guys —

i am a 17-year-old student from England, and although I am an Atheist, I am very interested in religion and have a peculiar question. I would be curious to know:

  • Why is the Communion wafer circular?

Given that the Eucharist forms such a vast and important part of Catholicism, there must be some reason or reasoning behind it, even if it's only a practical, rather than symbolic, one.

I very much hope you can enlighten me and satisfy my curiosity!

Thanks kindly for your time,

Tom

  { Why is the Communion wafer used for the Eucharist circular? }

Mike replied:

Hi, Tom —

Thanks for the question.

I found this in the 1909 Catholic Encyclopedia on the New Advent website under Altar Breads.
I think this is the best we can do. The following is from that article:

Bread is one of the two elements absolutely necessary for the sacrifice of the Eucharist. It cannot be determined from the sacred text whether Christ used the ordinary table bread or some other bread specially prepared for the occasion.

In the Western Church the altar-breads were probably round in form. Archaeological researches demonstrate this from pictures found in the catacombs, and Pope St. Zephyrinus (A.D. 201-219) calls the altar-bread coronam sive oblatam sphericae figurae.

In the Eastern churches, they are round or square. Formerly the laity presented the flour from which the breads were formed. In the Eastern Church, the breads were made by consecrated virgins; in the Western Church, by priests and clerics (Benedict XIV, De Sacrif. Missae, I, section 36). This custom is still in vogue in the Armenian Church.

The earliest documentary evidence that the altar-breads were made in thin wafers is the answer which Cardinal Humbert, legate of St. Leo IX, made [in] the middle of the eleventh century to Michael Cerularius, Patriarch of Constantinople. These wafers were sometimes very large, as from them small pieces were broken for the Communion of the laity, hence the word particle for the small host; but smaller ones were used when only the celebrant communicated.
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As a rule the image of Christ crucified should be impressed on the large host (Congregation for Sacred Rites, 6 April, 1834), but the monogram of the Holy Name (Ephem. Lit., XIII, 1899, p. 686), or the Sacred Heart (ibid., p. 266) may also be adopted.

The altar-breads assumed different names according as they had reference to the Eucharist as a sacrament or as a sacrifice: bread, gift (donum), table (mensa) allude to the Sacrament, which was instituted for the nourishment of our soul; oblation victim, host, allude to sacrifice. Before the tenth century the word "host" was not employed, probably because before this time the Blessed Eucharist was considered more frequently as a sacrament than as a sacrifice, hence the Fathers use such expressions as communion (synaxis), supper (coena), breaking of bread, etc., but at present the word "host" is used when referring to the Eucharist either as a sacrament or as [the|a] sacrifice.

Also in a recent document from the Vatican it stated:

Redemptionis Sacramentum - On certain matters to be observed or to be avoided regarding the Most Holy Eucharist

1. The Matter of the Most Holy Eucharist

[49.] By reason of the sign, it is appropriate that at least some parts of the Eucharistic Bread coming from the fraction should be distributed to at least some of the faithful in Communion. Small hosts are, however, in no way ruled out when the number of those receiving Holy Communion or other pastoral needs require it and indeed small hosts requiring no further fraction ought customarily to be used for the most part.

From the Congregation For Divine Worship And The Discipline Of The Sacrament
19 March 2004

Hope this helps,

Mike

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