"first coat of paint or other material given to any surface," c. 1600, verbal noun from prime (v.). Meaning "act of priming a firearm" is by 1590s; that of "gunpowder in the pan of a firearm" is from 1620s.
prime minister
primer
primerole
primeval
primigravida
priming
primipara
primitive
primitivism
primo
primogenitor
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