| pinna | (noun) the externally visible cartilaginous structure of the external ear | Synonyms: auricle, ear |
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| (noun) division of a usually pinnately divided leaf | Synonyms: pinnule |
| pinnace | (noun) a boat for communication between ship and shore | Synonyms: cutter, ship's boat, tender |
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| pinnacle | (noun) (architecture) a slender upright spire at the top of a buttress or tower | - |
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| (noun) a lofty peak | - |
| (noun) the highest level or degree attainable; the highest stage of development | Synonyms: acme, elevation, height, meridian, peak, summit, superlative, tiptop, top |
| pinnatiped | (noun) aquatic carnivorous mammal having a streamlined body specialized for swimming with limbs modified as flippers | Synonyms: pinniped, pinniped mammal |
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| pinner | (noun) a woman's cap with two long flaps pinned on | - |
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| pinning | (noun) a mutual promise of a couple not to date anyone else; on college campuses it was once signaled by the giving of a fraternity pin | - |
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| pinniped | (noun) aquatic carnivorous mammal having a streamlined body specialized for swimming with limbs modified as flippers | Synonyms: pinnatiped, pinniped mammal |
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| pinnule | (noun) division of a usually pinnately divided leaf | Synonyms: pinna |
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| pinny | (noun) a sleeveless dress resembling an apron; worn over other clothing | Synonyms: jumper, pinafore |
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