Grain

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Grain

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1. An elongated molding or extrusion of solid propellant for a rocket, regardless of size. </dd>
2. In photography, a small particle of metallic silver remaining in a photographic emulsion after development and fixing. In the agglomerate, these grains form the dark area of a photographic image. </dd>
3. An individual crystal in a polycrystalline metal or alloy. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use