From ZooTerms (Dictionary of Invertebrate Zoology)
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brushes (noun, plural; Old French broisse, brushwood): 1. A cluster of bristles, stout hairs or scales.

2. (Arthropoda: Insecta) a. In Diptera, anteriormouth bristles” of some mosquitoe larvae, that may or may not be prehensile; posterior or respiratory siphon area bristles. b. In Lepidoptera, anterior pheromone hair-like scales of noctuid moths, or posterior abdominal brush of smooth hairs, function unknown.