| alula | (noun) tuft of small stiff feathers on the first digit of a bird's wing | Synonyms: bastard wing, spurious wing |
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| (noun) scalelike structure between the base of the wing and the halter of a two-winged fly | Synonyms: calypter |
| cellularity | (noun) the state of having cells | - |
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| cellulite | (noun) lumpy deposits of body fat especially on women's thighs etc. | - |
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| cellulitis | (noun) an inflammation of body tissue (especially that below the skin) characterized by fever and swelling and redness and pain | - |
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| celluloid | (noun) a medium that disseminates moving pictures | Synonyms: cinema, film |
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| (noun) highly flammable substance made from cellulose nitrate and camphor; used in e.g. motion-picture and X-ray film; its use has decreased with the development of nonflammable thermoplastics | - |
| cellulose | (noun) a polysaccharide that is the chief constituent of all plant tissues and fibers | - |
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| cellulosic | (noun) a plastic made from cellulose (or a derivative of cellulose) | - |
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| hypercellularity | (noun) the state of having abnormally many cells | - |
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| hypocellularity | (noun) the state of having abnormally few cells | - |
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| lull | (noun) a period of calm weather | Synonyms: quiet |
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| (noun) a pause during which things are calm or activities are diminished | Synonyms: letup |
| lullaby | (noun) the act of singing a quiet song to lull a child to sleep | Synonyms: cradlesong |
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| (noun) a quiet song intended to lull a child to sleep | Synonyms: berceuse, cradlesong |
| lulu | (noun) a very attractive or seductive looking woman | Synonyms: beauty, dish, knockout, looker, mantrap, peach, ravisher, smasher, stunner, sweetheart |
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| lulz | (noun) An objective that is worth achieving only for its own enjoyment | - |
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| nitrocellulose | (noun) a nitric acid ester; used in lacquers and explosives | Synonyms: cellulose nitrate, guncotton, nitrocotton |
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| petiolule | (noun) the stalk of a leaflet | - |
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| pullulation | (noun) a rapid and abundant increase | - |
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| (noun) asexual reproduction in which a local growth on the surface or in the body of the parent becomes a separate individual | Synonyms: gemmation |
| pyrocellulose | (noun) nitrocellulose containing less nitrogen than guncotton; used in making smokeless powder | - |
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| ululation | (noun) a long loud emotional utterance | Synonyms: howl, howling |
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