labellum
Concise Oxford English Dictionary © 2008 Oxford University Press:
labellum /ləˈbɛləm/
▶noun (pl. labella)
- 1 Entomology a lobe at the tip of the proboscis in some insects.
- 2 Botany a larger central petal at the base of an orchid flower.
– origin C19: from L., dimin. of labrum ‘lip’.
'labellum' also found in these Oxford entries:

