0 to kill an animal for meat -- macellare
1 to kill a lot of people in a cruel way -- massacrare
2 a situation in which a lot of people or animals are killed in a cruel way -- macello, carneficina
3 the killing of people or animals in large numbers, cruelly and usually unnecessarily -- massacro
4 the killing of animals for food -- macellazione
Methods of slaughter must be humane.