dead thing; useless item
Refers to something that is dead or lifeless, often used figuratively for a useless or worthless object. Somewhat literary or formal.
That old machine is just a useless item now.
Let's throw away the dead things and buy new ones.
saprophagy
Compound of 死 (death) and 物 (thing). The exact historical derivation is uncertain, but the meaning is transparent from the kanji.