What does labellum mean?
Labellum is a technical term for a lip-like structure in biology. In insects and related animals, it can refer to a specialized part of the mouth, often the lower lip. In orchids, the word names a distinctive modified petal that is frequently larger or more colorful than the other petals and may serve to attract pollinators or guide them toward the flower's reproductive structures. The term comes from Latin and literally means 'little lip.' Although it is usually encountered in scientific writing, it is especially associated with the intricate flower structures of orchids, where a labellum may function much like a landing platform for insects. In general biological usage, labellum is more specific than the broader word lip or labium.
A specialized lip-like structure forming part of the mouthparts of an insect or other arthropod.
"The beetle's labellum helped it gather food from the flower."
Usually used in entomological or anatomical contexts.
The modified, often showy median petal of an orchid flower.
"The labellum bears nectar guides that direct bees toward the column."
This is the most familiar botanical use of the word.
The regular plural is labellums; in formal botanical and zoological writing, the plural labell a is also used.
"Several orchid species have prominent yellow labellums."
In orchids, the labellum is a modified petal that acts like a landing platform and guide for pollinators, often becoming the flower's most showy feature.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does labellum come from?
Labellum comes from Latin labellum, a diminutive of labrum, meaning 'lip.' English borrowed the Latin word in the sense of a lip-like anatomical structure. The same Latin root also underlies words such as label and labial, although their later development and meanings are distinct.
Related word forms
How labellum is actually used
In entomology, the term is used for a specialized part of the mouthparts. In botany, it refers specifically to the orchid's distinctive modified median petal.
Easily confused with labellum
A labium is a general term for a lip or lip-like part, especially in insects and other animals, whereas a labellum is more specifically a distinct lip-like structure such as an insect's lower lip or an orchid's modified petal.