From ZooTerms (Dictionary of Invertebrate Zoology)
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finger (noun; Anglo-Saxon finger, finger): 1. Any structure resembling or used like a finger.

2. (Arthropoda: Crustacea) a. In Decapoda, one of the scissor-like blades at the end of the cheliped, usually one is movable and one fixed. b. In Ostracoda, a dorsal and ventral process of the male copulatory apparatus which are thought to be tacticle organs and may also assist in directing or holding certain structures during copulation.