Definition of primers:
(n) :
A children's book intended to teach literacy: how to read, write, and spell.
(n) :
An introductory text on any subject, particularly basic concepts.
(n) :
Any substance or device, such as priming wire or blasting cap, used to ignite gunpowder or other explosive.
(n) :
A substance used to prime wood, metal, etc. in preparation for painting.
(n) :
A layer of makeup that goes beneath the foundation; undermakeup.
(n) :
(biochemistry, genetics) A molecule which initiates the synthesis of an enzyme, (especially) a single-stranded nucleic acid molecule which initiates DNA replication.