From ZooTerms (Dictionary of Invertebrate Zoology)
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fulcrum (noun; plural fulcrums; Latin fulcrum, support): 1. Any structure that props or supports another.

2. (Arthropoda: Insecta) a. In Heteroptera, the trochantin. b. In lower hemimetabolous insects, a sclerotized fulcrum formed by two ligual sclerites joined proximally on the ventral surface of the hypopharynx. c. In Diptera and Hymenoptera, the horny part of the lingula.

3. (Mollusca: Bivalvia) That portion to which the cartilage is attached; chondrophore.

4. (Rotifera) The unpaired trophus of the mastax.