noun, plural la·bel·la [luh-bel-uh] /ləˈbɛl ə/. Botany.
Origin of labellum
Examples from the Web for labellum
This leads me to conclude that the labellum is always a compound organ.
The ovaries in many cases were not twisted, so that the labellum was consequently uppermost.Across Iceland|William Bisiker
This is important, as it explains all the astounding projections on the labellum of Oncidium, Phalaenopsis, etc.
In a similar way the petals and labellum of Odontoglossum Uro-Skinneri have been found reduced to filamentous processes.Vegetable Teratology|Maxwell T. Masters
The whole insect is of a bright pink colour, the large and oval abdomen looking like the labellum of an orchid.Darwinism (1889)|Alfred Russel Wallace