Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The median petal of an orchid flower, usually different in shape, size, or color from the two lateral petals; lip.
  • noun A liplike part, such as the tip of the labium of certain flies, used for lapping up liquids.

from The Century Dictionary.

  • noun In botany, one of the three divisions of an orchidaceous corolla, differing from the others in shape or direction, and not seldom spurred; the lip.
  • noun In entomology, a part of the mouth of an insect, by some considered to be the epipharynx. In Diptera the labellum is one of a pair of tumid lobes terminating the theca of the proboscis.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Bot.) The lower or apparently anterior petal of an orchidaceous flower, often of a very curious shape.
  • noun (Zoöl.) A small appendage beneath the upper lip or labrum of certain insects.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The lower central petal of orchid flowers, usually developed to be showy and attract pollinators.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Latin, diminutive of labrum, lip; see leb- in Indo-European roots.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin labellum ("small tub or basin"), diminutive of labrum ("basin, tub"), from lavō ("bathe").

Examples

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