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pinnaOne entry found. Main Entry: pin·na Pronunciation: \ˈpi-nə\ Function: noun Inflected Form(s): plural pin·nae \ˈpi-ˌnē, -ˌnī\ or pinnas Etymology: New Latin, from Latin, feather, wing — more at pen Date: 1719 1 a : a projecting body part (as a feather, wing, or fin) b : the largely cartilaginous projecting portion of the external ear — see ear illustration
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