1. the lower petal of an orchid flower, often enlarged and distinctively shaped
Usage: botanical
2. a lip-like structure in certain insects, especially the lower lip of some flies
Usage: entomological

Examples

• The orchid’s labellum was beautifully spotted with purple markings.
• Botanists use the shape of the labellum to identify different orchid species.
• The bee landed on the orchid’s labellum to collect nectar.
• Each orchid variety has a distinctively shaped labellum.
• The fly’s labellum helps it feed on liquid substances.
• Researchers studied the labellum structure under a microscope.