There are 2 definitions of primer in English:

primer1

Syllabification: prim·er
Pronunciation: /ˈprīmər
 
/

noun

1A 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.
More example sentences
  • Paint each plate rail with primer and two coats of white enamel.
  • Research shows that one coat of tinted primer and one coat of paint will give you a better paint job than two coats of paint.
  • Sand the areas until they are smooth and coat them with interior primer and let it dry completely.
1.1A cosmetic applied to the face before another product, intended to improve the coverage and lasting effect of the second product: it’s best to apply primer around the eye to help the makeup blend properly
More example sentences
  • I have never needed primer: nothing shifts on my eyelids.
  • Skin Base can be used as a primer, concealer or foundation and is available in 18 shades.
  • Primer is one of those beauty secrets that can make a big difference in the look and wear of your makeup.
2A cap or cylinder containing a compound that responds to friction or an electrical impulse and ignites the charge in a cartridge or explosive.
More example sentences
  • When a firing pin drops on a primer igniting the powder charge, the cartridge and cylinder move slightly forward.
  • Lead is a key component in primers as well as bullets, and is responsible for holding together other chemicals that create the controlled explosion of the primer.
  • The honest concern is about airborne lead ejected by the primer and bullet when a cartridge is fired.
3A small pump for pumping fuel to prime an internal combustion engine, especially in an aircraft.
More example sentences
  • While cranking, keep your hand on the primer so you can give it a quick shot as the cylinders fire.
  • The engine primer needs to be used only if the engine is ‘cold-soaked’ (at least 5 hours since it was last run).
4 Biochemistry A molecule that serves as a starting material for a polymerization process.
More example sentences
  • The primase utilizes the DNA strands as templates and synthesizes a short stretch of RNA generating a primer for DNA polymerase.
  • The attached glucose is believed to serve as the primer required by glycogen synthase.
  • The additional nucleotide used on both primers was adenine.

Definition of primer in:

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Word of the day meretricious
Pronunciation: merəˈtriSHəs
adjective
apparently attractive but having in reality no value...

There are 2 definitions of primer in English:

primer2

Syllabification: prim·er
Pronunciation: /ˈprimər
 
/

noun

An elementary textbook that serves as an introduction to a subject of study or is used for teaching children to read.
More example sentences
  • I've been for the last couple of years, looking at children's books, looking at primers that kids read in first grade and second grade, over this century.
  • Children used to learn to read from primers that showed pictures of things with their names underneath, to teach them what the written signifier meant.
  • Gaustad's work is unique in this regard and will serve as one of the best historical primers on the subject for years to come.

Origin

late Middle English: from medieval Latin primarius (liber) 'primary (book)' and primarium (manuale) 'primary (manual)'.

Definition of primer in: