Troper (Lat. liber /libellus troparius, troparium, troperium, tropiarium, troporium, troponarius, trophonarius). A medieval book, booklet, or section of a book containing a significant number of tropes (chants introducing, and/or interpolated within, the chants of the mass proper and ordinary and sometimes of the office, such as the Benedicamus Domino).
John Beleth’s liturgical commentary (Summa de ecclesiasticis officiis, ca. 1160-64) defines a troper as follows: ‘a trophonarius is a book in...
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