Labellum n. : The lower or apparently anterior petal of an orchidaceous flower, often of a very curious shape.

Labellum n. : A small appendage beneath the upper lip or labrum of certain insects.

Example:
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Taxonomy
labellum, free encyclopedia, petal, orchid flower, insects, search, Showy Lady Slipper, Cypripedium reginae, pink, Petalum, Lip, acts, landing, platform, sepals, irregular shape, Canna x orchiodes, Cannas.

Defination from the web:
Labellum. The labellum (or Lip) is part of an Orchid, Canna or other less known flower that serves to attract insects that ... The labellum is a modified petal and can be distinguished from the other petals and from the sepals by its large size and its often irregular shape. ...