Melismatic

Because slower metrical types are more melismatic and ornamented than primary-meter, their melodic-passages in both xipi and erhuang are more melismatic and complex than those of primary-meter.

1998, Barbara Newman, Introduction, Barbara Newman (translator), Hildegard von Bingen, Symphonia: A Critical Edition of the Symphonia armonie celestium revelationum, Cornell University Press, 2nd Edition, page 28, In general, the more melismatic a piece, the more solemn, elaborate, and difficult it is, and the more the text is dominated by the music.

The melismatic content of this chant lies at the extreme of what is typical for responsories, usually considered among the most melismatic chant types.