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From The Collaborative International Dictionary of English v.0.48:
Kneebrush \Knee"brush`\ (n[=e]"br[u^]sh`), n. 1. (Zool.) A tuft or brush of hair on the knees of some species of antelopes and other animals; -- chiefly used in the plural. [1913 Webster] 2. (Zool.) A thick mass or collection of hairs on the legs of bees, by aid of which they carry the collected pollen to the hive or nest; -- usually in the plural. [1913 Webster]