| binnacle | (noun) a nonmagnetic housing for a ship's compass (usually in front of the helm) | - |
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| 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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| cachinnate | (verb) laugh loudly and in an unrestrained way | - |
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| cachinnation | (noun) loud convulsive laughter | - |
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| cinnabar | (adjective) of a vivid red to reddish-orange color | Synonyms: Chinese-red, vermilion, vermillion |
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| (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 |
| (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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| imparipinnate | (adjective) (a leaf shape) pinnate with a single leaflet at the apex | Synonyms: odd-pinnate |
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| innards | (noun) internal organs collectively (especially those in the abdominal cavity) | Synonyms: entrails, insides, viscera |
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| innate | (adjective) not established by conditioning or learning | Synonyms: unconditioned, unlearned |
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| (adjective) being talented through inherited qualities | Synonyms: born, natural |
| (adjective) present at birth but not necessarily hereditary; acquired during fetal development | Synonyms: congenital, inborn |
| innately | (adverb) in an innate manner | - |
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| innateness | (noun) the quality of being innate | - |
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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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| 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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| tintinnabulate | (verb) ring or sound like a small bell | - |
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| tintinnabulation | (noun) the sound of a bell ringing | Synonyms: ring, ringing |
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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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