English

Noun

chrismon ‎(plural chrismons or chrisma)

1. A Christogram.
   • 1869, Chambers's Journal, page 818:

     The sacred monogram or chrismon was extensively used by Constantine […] a crown of gold, enclosing the chrismon or mysterious monogram

2. (palaeography) A stylised siglum or character interpreted as an invocation of Christ in Merovingian and Carolingian documents.
   • 1970, Encyclopedia Britannica, volume 7, page 478:

     The document usually begins with a verbal invocation (such as In Dei nomine, amen) or a chrismon (often Christ's monogram formed from the letters XP)

3. A Christmas decoration with explicitly Christian religious symbolism.
   • 1964, The Lutheran Witness, volume 83, page 548:

     Chrismons were first made as tree decorations by members of the Lutheran Church of the Ascension, Daville, Va., in 1957.

Usage notes

In English scholarly usage, the meaning of chrismon (uncountable) is mostly limited to the Chi Rho monogram. In 18th-century German usage, by contrast, the term was expanded to include the derived cross-like sigla not only in Merovingian and Carolingian times but throughout the medieval period. English scholarly usage rarely adopts this extended usage specifically in the context of Merovingian and Carolingian paleography.

The modern term used in American Christianity is often capitalised, as Chrismon, and uses the plural Chrismons.

References

1. ↑ George Henry Lane Fox Pitt-Rivers, The riddle of the 'Labarum' and the origin of Christian symbols, Allen & Unwin, 1966, p. 28; "I can find no roots, etymology or grounds for the adoption of the word adopted by some Christans, 'Chrismon' , which is supposed to mean the 'Monogram of Christ', and which appears in some dictionaries (i.e. Funk and Wagnalis, 1922)."
2. ↑ Gregor Max Gruber, Lehrsystem einer allgemeinen Diplomatik vorzüglich für Oesterreich und Deutschland vol. 1 (1783), 148ff.
3. ↑ so in The Lutheran Witness, Volume 83 (1964), p. 548 "the Chrismon (from CHRISt-MONogram) tree", and in James Edgar, Ellen Edgar, A Chrismon Service (1981), p. 2.