uncus

From ZooTerms (Dictionary of Invertebrate Zoology)
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uncus (noun; plural unci; Latin uncus hook): 1. (Arthropoda: Insecta) a. In some larvae, a hooked process on the distal inner margin of the maxillary mala, possibly a reminant of the lacinia. b. In Lepidoptera, a process of the 10th abdominal tergum overhanging the anus.

2. (Rotifera) One of a pair of the seven main pieces of the mastax.