requiem

noun5

1. •
   A Mass (especially Catholic) to honor and remember a dead person.
2. •
   A musical composition for such a mass.
3. •
   A piece of music composed to honor a dead person.
4. •
   A large or dangerous shark, specifically, (zoology) a member of the family Carcharhinidae.

   • Any man-eater is called a requiem. — 1973
5. •
   (no longer used) Rest; peace.