the.com/digestive system

means The group of organs — mouth, esophagus, stomach, intestines, liver, pancreas, and more — that break food down into nutrients your body can absorb and waste it can discard.

from 'Digestive' traces back to the Latin digerere, meaning 'to divide, separate, carry apart' (di- 'apart' + gerere 'to carry'). The idea is literally one of sorting: Roman writers used it for organizing thoughts or arranging things in order, and medical Latin borrowed that sense for the gut's job of breaking food apart into something the body can use. 'System,' from Greek systema, 'organized whole,' arrived later to describe the organs as a coordinated unit rather than separate parts — a tidy bit of linguistic irony, since that's exactly what digestion does to your lunch.