Homonym: Residue (Remnant)
Residue refers to the remaining substance left after a process has occurred, such as a chemical reaction, cooking, or filtration. It can be solid, liquid, or gas, depending on the context. For example, in cooking, residue might be the leftover bits of food stuck to a pan after frying.
In chemistry, residue often describes the material that remains after a reaction or the byproducts that are not part of the desired product. This can include impurities or unreacted substances. Understanding residue is important in fields like pharmaceuticals and environmental science to ensure safety and effectiveness.