noun Botany.
a thin, membranous outgrowth from the base of the blade of most grasses.
a strap-shaped corolla, as in the ray flowers of the head of certain composite plants.

1595–1605; < Latin ligula; see ligula Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ligule or ligula (ˈlɪɡjuːl)
1.  a membranous outgrowth at the junction between the leaf blade and sheath in many grasses and sedges
2.  a strap-shaped corolla, such as that of a ray floret in the daisy
[C19: via French, from Latin ligula strap, variant of lingula, from lingua tongue]
ligula or ligula
[C19: via French, from Latin ligula strap, variant of lingula, from lingua tongue]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
ligule   (lĭg'yl)  Pronunciation Key 
A straplike structure, such as the corolla of fused petals in a ray flower or a membranous or hairy appendage between the sheath and blade of a grass leaf.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The ligule is a conspicuous tuft of long white hair.
There is a short fringe of hairs on the leaf where it meets the stem, which is
  known as a ligule.
The leaf basal sheath is hairy, the leaf blade is generally rolled, and the
  ligule is short.
Ligule, where leaf blade joins stem, consists of a fringe of hairs.
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