feces
n. plural-only C1 Advanced US //ˈfiˌsiz// fe·ces
n. the solid waste that leaves the body after food is digested.
n. waste matter discharged from the bowels after food has been digested. Often used in medical or scientific contexts to describe excrement.
The doctor asked for a sample of his feces.
Scientists analyzed the fossilized feces to determine what the ancient animals ate.
Proper sanitation systems are essential for public health because they prevent the spread of diseases found in human feces, which can contaminate local water supplies.
From Latin faecēs, nominative plural of faex (“residue, dregs”), further origin unknown; possibly borrowed from a substrate language.
Usage
Takes a plural verb ('feces are') and has no singular form in common usage.