The term MONET MEDIUM is a reference to the French Impressionist painter Claude Monet. The two crossword solutions, OIL (3 letters) and OILS (4 letters), refer to the type of paint that Monet used in his artwork. OIL paints are composed of pigments suspended in a drying OIL, such as linseed OIL, and are known for their vibrant colors and ability to create a wide range of textures. Monet's use of OIL paints was a major factor in the development of the Impressionist style.