From ZooTerms (Dictionary of Invertebrate Zoology)
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rasp (noun; Old French rasper, to scrape): 1. (Arthropoda: Crustacea) One or more rows of chitinous plates or scales on the pereopodal or uropodal surface segments.

2. (Arthropoda: Insecta) A roughened surface for the production of sound by friction

See also: strigulating organs.