How to sign: that which has mass and occupies space
"an atom is the smallest indivisible unit of matter";
Similiar / Same: substance
Categories: entity
Within this category: activator, adulterant, allergen, antigen, antimatter, assay, atom, ballast, bedding material, body substance, carcinogen, chemical element, chemical irritant, compound, culture medium, dark matter, denaturant, drift, element, emanation, essence, ferment, fluid, fluid, foamentation, food, fuel, grinding, humectant, hydrocolloid, inhibitor, inoculant, jelly, leaven, ligand, lysin, material, medium, medium, metabolite, micronutrient, mixture, philosopher's stone, phlogiston, poison, precursor, propellant, protoplasm, pyrogen, refrigerant, residue, sediment, sludge, solid, solute, solvate, substrate, system, vegetable matter, volatile, ylem