The term CHEMIST VESSEL is used to refer to two pieces of laboratory equipment. UREY is a four-letter word that refers to a type of flask, named after the American chemist Harold Urey, which is used for distillation and other processes. A DEWAR is a five-letter word that refers to a vacuum flask, named after the Scottish scientist James Dewar, which is used to store liquids at very low temperatures. Both of these vessels are essential tools for chemists in their work.