[with sing. or pl. v.] bits of meat, fish, or fowl, esp. pork, cooked in seasoned fat, mashed into a paste, and preserved in the fat for use as a spread for bread
used with a sing. or pl. verb A pâté made of pork, goose, or other meat that is chopped, seasoned, and slowly cooked in fat.
Origin of rillettesFrench from diminutive of Old French rille long strip of fat pork dialectal variant of earlier reille shingle, plank from Latin rēgula straight piece of wood, lath ; see reg- in Indo-European roots.