<p><strong>Noun</strong></p><ul><li>a large, amphibious rodent of the genus <em>Castor</em>, having sharp incisors, webbed hind feet, and a flattened tail, noted for its ability to dam streams with trees, branches, etc.</li><li>the fur of this animal.</li><li>a flat, round hat made of beaver fur or a similar fabric.</li><li>a tall, cylindrical hat for men, formerly made of beaver and now of a fabric simulating this fur.</li><li>Informal. a full beard or a man wearing one.</li><li>Informal. an exceptionally active or hard-working person.</li><li>Slang: Vulgar. a woman's pubic area.</li><li>Offensive. a term used to refer to a woman.</li><li>Textiles. a cotton cloth with a thick nap, used chiefly in the manufacture of work clothes.</li><li>(formerly) a heavy, soft, woolen cloth with a thick nap, made to resemble beaver fur.</li><li>a native or inhabitant of Oregon, the Beaver State (used as a nickname).</li></ul><p><strong>Verb</strong></p><ul><li>British. to work very hard or industriously at something (usually followed by away).</li></ul>