From ZooTerms (Dictionary of Invertebrate Zoology)
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genu (noun; plural genua; Latin genu, knee): 1. Any structure or organ with a knee-like bend.

2. (Arthropoda: Chelicerata) In Acari, the segment between the femur and tibia that is activated by its own muscles and tendons, corresponding with the patella in other groups of Chelicerata.