plural pinnae
ˈpi-ˌnē
-ˌnī
or pinnas
1
a
: a projecting body part (such as a feather, wing, or fin)
b
: the largely cartilaginous projecting portion of the external ear see ear illustration
2
: a leaflet or primary division of a pinnate leaf or frond
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Merriam-Webster unabridged
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