labium
/ˈleɪbɪəm
/noun (plural labia /ˈleɪbɪə/)
1 Entomology A fused mouthpart which forms the floor of the mouth of an insect.Biplica, in addition, lacks the strongly tubercled and denticulate labium of Eriptycha....
- Insects close off the posterior of the mouth with a second ‘lip,’ the labium.
- Several groups developed active predatory larvae, still showing the spoon-shaped labium.
2 Botany The lower lip of the flower of a plant of the mint family.
Origin
Late 16th century (in the general sense 'lip, lip-like structure'): from Latin, 'lip'; related to labrum.