noun, masculine/ˈatomo/plural: átomos
atom (the smallest possible amount of matter which still retains its identity as a chemical element)
Related: antiátomo, atómico, atomismo, atomista, atomizar
Learned borrowing from Latin atomus, from Ancient Greek ἄτομος (átomos, “indivisible”), from ἀ- (a-, “not”) + τέμνω (témnō, “to cut”).