Webster's English Dictionary

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pinna

pin.na \'pin-*\ \'pin-.e-, -.i-\ \'pin-*l\ n or pin.nae or pinnas [NL, fr. 
   L, feather, wing - more at PEN] pl  1: a leaflet or primary division of a 
   pinnate leaf or frond  2a: a feather, wing, or fin or some similar pinnate 
   leaf or frond a feather , wing, or fin or some similar part 2b: the largely 
   cartilaginous projecting portion of the external ear  - pin.nal aj