primer

US /ˈpraɪ.mɚ/
UK /ˈpraɪ.mɚ/
"primer" picture
1.

a preparatory coating applied to a surface before painting, wallpapering, or some other form of finishing

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Apply a coat of primer before painting the wall.
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This primer helps the paint adhere better.
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undercoatbase coatsealer
2.

a small explosive device used to ignite the main charge of a firearm or explosive

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The bullet contains a small primer at its base.
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He loaded the shotgun with new primers.
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detonatorigniterfuse
3.

a small book or booklet that introduces a subject or provides basic information

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This book serves as a good primer on quantum physics.
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She wrote a short primer for beginners learning to code.
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introductionmanualguidehandbooktextbook