Primer

Primer can refer to more than one thing: Template:Wiktionarypar

In molecular biology, a primer is nucleic acid strand (or related molecule) that serves as a starting point for DNA replication.
In pyrotechnics, a primer is also a common name for any substance used to start a fire.
In ammunition, and firearms a primer is a small charge that explodes when struck with force that ignites the gunpowder in ammunition. See: Percussion cap, internal ballistics.
In painting, a primer is a layer of paint put down on metal surfaces to enable it to better hold a coat of enamel paint. "Primer red," a dark reddish paint that gets its color from iron oxide, is frequently seen on vehicles where the owner has done or is doing their own body work.
In education, a primer is a textbook formerly used in primary education to teach the alphabet and other basic concepts. The famous New England Primer contained moralistic rhymes associated with the colonial American Puritan culture.
In Christianity, a primer is an old English word for a Book of Hours.
Primer is a 2004 feature film written and directed by Shane Carruth. It won the Grand Jury prize at the 2004 Sundance Film Festival.
On lawnmowers and many other small engines, the primer (or: primer bulb) is the button used to prime the engine with gasoline before starting it up - it performs the function of the choke.
Primer was a comic book published by Comico Comics.