Definitions:
a substance used as a preparatory coat on wood, metal, or canvas, especially to prevent the absorption of subsequent layers of paint or the development of rust

a cap or cylinder containing a compound which responds to friction or an electrical impulse and ignites the charge in a cartridge or explosive

a small pump for pumping fuel to prime an internal combustion engine, especially in an aircraft

a molecule that serves as a starting material for a polymerization process

an elementary textbook that serves as an introduction to a subject of study or is used for teaching children to read