tymbal

From ZooTerms (Dictionary of Invertebrate Zoology)
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tymbal (noun; French timbale, kettledrum): (Arthropoda: Insecta) In Hemiptera (Cicadidae), an area of thin cuticle supported by a cuticular rim and a series of dorso-ventral strengthening ribs; involved in sound production

See also: Pearman's organ.