- Bristle. A stiff hair; sometimes applied to the upper part of an awn, when the latter is bent. 2020 International Rules for Seed Testing (ISTA)
- Bristle. A stiff hair, the upped part of an bent awn. ISTA Handbook on Pure Seed Definitions, Glossary. 3rd Edition 2010.
- Bristle. A short stiff hair. Fenwick, J.R. revised 1995. Laboratory Manual for General Crops- Glossary. Unpublished class notes. Dept. of Soil and Crop Sciences, Colorado State University. Pages 104-111
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