From ZooTerms (Dictionary of Invertebrate Zoology)
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salivarium (noun; Latin saliva, spit): 1. (Arthropoda: Chelicerata) In Acarina, the chamber in the buccal cone into which the salivary ducts open.

2. (Arthropoda: Insecta) The small cavity behind the hypopharynx and between it and the labium into which the salivary duct opens.