| binnacle | (noun) a nonmagnetic housing for a ship's compass (usually in front of the helm) | - |
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| cachinnation | (noun) loud convulsive laughter | - |
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| cinnabar | (noun) large red-and-black European moth; larvae feed on leaves of ragwort; introduced into United States to control ragwort | Synonyms: Callimorpha jacobeae, cinnabar moth |
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| (noun) a heavy reddish mineral consisting of mercuric sulfide; the chief source of mercury | - |
| cinnamene | (noun) a colorless oily liquid; the monomer for polystyrene | Synonyms: phenylethylene, styrene, vinylbenzene |
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| cinnamon | (noun) spice from the dried aromatic bark of the Ceylon cinnamon tree; used as rolled strips or ground | - |
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| (noun) tropical Asian tree with aromatic yellowish-brown bark; source of the spice cinnamon | Synonyms: Ceylon cinnamon, Ceylon cinnamon tree, Cinnamomum zeylanicum |
| (noun) aromatic bark used as a spice | Synonyms: cinnamon bark |
| finnan | (noun) haddock usually baked but sometimes broiled with lots of butter | Synonyms: finnan haddie, finnan haddock, smoked haddock |
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| innards | (noun) internal organs collectively (especially those in the abdominal cavity) | Synonyms: entrails, insides, viscera |
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| innateness | (noun) the quality of being innate | - |
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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 |
| 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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| spinnability | (noun) the quality of being suitable for spinning or the capability of being spun (used of textile fibers) | - |
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| spinnaker | (noun) a large and usually triangular headsail; carried by a yacht as a headsail when running before the wind | - |
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| tintinnabulation | (noun) the sound of a bell ringing | Synonyms: ring, ringing |
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