the petal of an orchid that differs more or less markedly from the other petals, often forming the most conspicuous part; the lip.
- la·bel·loid, adjective
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How to use labellum in a sentence
Harrisoniae in colour and size of sepal and petal; in general shape and in the hues of the labellum after L. purpurata.The Woodlands Orchids | Frederick Boyle
Certainly, if I may trust the vessels, the simple labellum of Gymnadenia consists of three organs soldered together.
My case of the Aceras with the aborted labellum squeezed against stigma supports your view.
I am still more pleased that I was right about insects gnawing the fleshy labellum.
This is important, as it explains all the astounding projections on the labellum of Oncidium, Phalaenopsis, etc.
British Dictionary definitions for labellum
the part of the corolla of certain plants, esp orchids, that forms a distinct, often lobed, lip
a lobe at the tip of the proboscis of a fly
- labelloid, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012