carminum

Etymology 2
Back-formation from, the nominative/accusative plural of the third-declension noun.

Noun

 * 1)  plural of song, poem
 * 2) * 1600s, Cornelius a Lapide, Commentarii in Sacram Scripturam, Tomus X: Acts, James, Epistles of John, the Apocalypse, p 1360: Et Sybilla lib. 6. Carminum:
 * 1) * 1600s, Cornelius a Lapide, Commentarii in Sacram Scripturam, Tomus X: Acts, James, Epistles of John, the Apocalypse, p 1360: Et Sybilla lib. 6. Carminum: