From ZooTerms (Dictionary of Invertebrate Zoology)
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bothridium (noun; plural bothridia; Greek diminutive bothros, trench): 1. (Arthropoda: Chelicerata) A chitinous cavity or projecting cup in which a bothridial seta is inserted; (bothridial seta + bothridium = trichobothrium).

2. (Platyhelminthes: Cestoda) One of 4 muscular lappets on the scolex of a tapeworm, often highly specialized with many types of adaptations for adhesion.