recrement
/ˈrɛkrɪm(ə)nt/noun
1The superfluous or useless portion of a substance; refuse, dross, scum.
2 Figurative. A superfluous or useless fragment, a remnant, a piece of rubbish; leftover or discarded material, rubbish, dregs.
Origin
Late 16th century (in an earlier sense). From classical Latin recrēmentum refuse, waste, dross (from re- + cernere + -mentum). Compare Middle French recrement, French récrément (collective) impurities mixed with a substance, waste products which remain within an organism.