noun pin·nule \ˈpin-(ˌ)yül\

Definition of PINNULE

:  any of the secondary branches of a plumose organ especially of a crinoid
:  one of the ultimate divisions of a twice pinnate leaf

Origin of PINNULE

New Latin pinnula, from Latin, diminutive of pinna
First Known Use: 1748


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July 06, 2015
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