triduum means A period of three days (especially in Roman Catholic liturgy). Lexicurio rates it Sui generis — a strength score of 87 out of 100.
triduum is pronounced /ˈtɹɪ.dju.əm/.
Why “triduum” is a great word
TRIDUUM — [Noun] A period of three days, especially one of solemn liturgical observance in the Roman Catholic tradition. From the Latin trīduum, from trēs ("three") + diēs ("day"). Unlike a novena, which extends prayer across nine successive days, or an octave, which prolongs a feast for eight, a triduum is a single, compressed sacred unit. It is the gathering dusk of Holy Thursday, the hollow silence of Good Friday, and the kindling of the Easter vigil fire—a triple pulse measuring the profound work of grief and hope in the ancient rhythm of three.
noun
- A period of three days (especially in Roman Catholic liturgy).“I’m much more comfortable on Maundy Thursday, the beginning of the Triduum, the holiest three days in the Christian calendar.”