ligule

noun
lig·​ule | \ˈli-(ˌ)gyül \

Definition of ligule 

: a scalelike projection especially on a plant: such as

a : a thin appendage of a foliage leaf and especially of the sheath of a blade of grass

b : a ligulate corolla of a ray floret in a composite head

First Known Use of ligule

circa 1847, in the meaning defined above

History and Etymology for ligule

New Latin ligula, from Latin, small tongue, strap, from lingere to lick — more at lick

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The first known use of ligule was circa 1847

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More from Merriam-Webster on ligule

Britannica.com: Encyclopedia article about ligule

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