| bipinnate | (adjective) of a leaf shape; having doubly pinnate leaflets (as ferns) | - |
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| bipinnatifid | (adjective) pinnatifid with the segments also pinnatifid | - |
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| imparipinnate | (adjective) (a leaf shape) pinnate with a single leaflet at the apex | Synonyms: odd-pinnate |
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| paripinnate | (adjective) (of a leaf shape) pinnate with a pair of leaflets at the apex | Synonyms: abruptly-pinnate, even-pinnate |
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| 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 |
| (verb) raise on or as if on a pinnacle | - |
| (verb) surmount with a pinnacle | - |
| pinnate | (adjective) (of a leaf shape) featherlike; having leaflets on each side of a common axis | Synonyms: pinnated |
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| pinnated | (adjective) (of a leaf shape) featherlike; having leaflets on each side of a common axis | Synonyms: pinnate |
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| pinnately | (adverb) having a pinnate shape | - |
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| pinnatifid | (adjective) (of a leaf shape) cleft nearly to the midrib in broad divisions not separated into distinct leaflets | - |
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| 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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| pinnatisect | (adjective) (of a leaf shape) cleft nearly to the midrib in narrow divisions not separated into distinct leaflets | - |
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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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| spinnability | (noun) the quality of being suitable for spinning or the capability of being spun (used of textile fibers) | - |
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| spinnable | (adjective) capable of being spun into fibres | Synonyms: spinnbar |
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| (adjective) capable or susceptible to being influenced by biased information | - |
| spinnaker | (noun) a large and usually triangular headsail; carried by a yacht as a headsail when running before the wind | - |
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| spinnbar | (adjective) capable of being spun into fibres | Synonyms: spinnable |
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| spinnbarkeit | (noun) the capacity of a viscous liquid (especially the cervical mucus) to be drawn out into a strand or blown up into a bubble | - |
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| spinner | (noun) fisherman's lure; revolves when drawn through the water | - |
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| (noun) board game equipment that consists of a dial and an arrow that is spun to determine the next move in the game | - |
| (noun) someone who spins (who twists fibers into threads) | Synonyms: spinster, thread maker |
| spinney | (noun) a copse that shelters game | - |
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| spinning | (noun) creating thread | - |
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| tripinnate | (adjective) (of a leaf shape) thrice pinnate | Synonyms: tripinnated |
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| tripinnated | (adjective) (of a leaf shape) thrice pinnate | Synonyms: tripinnate |
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| tripinnatifid | (adjective) (of a leaf shape) bipinnatifid with segments pinnatifid | - |
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