A substance used as a preparatory coat on previously unpainted wood, metal, or canvas, especially to prevent the absorption of subsequent layers of paint or the development of rust.

Before painting the walls, we applied a primer to ensure the paint would adhere properly.

A small introductory book on a subject, often used for teaching children to read.

The teacher handed out a primer to help the students learn the basics of arithmetic.

A cap or cylinder containing a compound that ignites the charge in a cartridge or explosive.

The hunter checked the primer on his ammunition to ensure it was in good condition before heading out.

Biochemistry. A short strand of RNA or DNA that serves as a starting point for DNA synthesis.

The PCR reaction requires a forward and a reverse primer to amplify the target sequence.

A person or device that primes or applies primer.

The assembly line uses an automated primer to coat each component.

A cosmetic product applied to the skin before makeup to create a smooth base and help makeup last longer.

She applied a hydrating primer before foundation to keep her makeup in place.

primeradjective

Serving as or relating to a primer; acting as an initial coat or introduction.

After the primer coat dried, we applied two layers of glossy paint.