From ZooTerms (Dictionary of Invertebrate Zoology)
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glossa (noun; Greek glossa, tongue): (Arthropoda: Insecta) One of a pair of terminal lingular lobes of the labium of certain insects, between the paraglossae; the medium ligula. a. In adult Hymenoptera, the fused glossae that form the tongue. b. In Thysanoptera, the median ligula that forms the apical tip of the wall of the mouth cone.