- the petal of an orchid that differs more or less markedly from the other petals, often forming the most conspicuous part; the lip.
Origin of labellum
1820–30; < Latin, diminutive of labrum lip; for formation see castellum
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for labellum
This leads me to conclude that the labellum is always a compound organ.More Letters of Charles Darwin Volume II
Is it not curious the way the labellum sits on the top of the column?More Letters of Charles Darwin
Petals and sepals are white, and there is a white patch on the labellum.The Woodlands Orchids
Duchartre describes an instance wherein one of the outer sepals of Cattleya Forbesii was adherent to the labellum.
The blossom is normal as to the proper perianth, except that the labellum is unusually papillose, bearded almost to the base.
- 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
C19: New Latin, diminutive of Latin labrum lip
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