| klavern | (noun) a local unit of the Ku Klux Klan | - |
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| klaxon | (noun) a kind of loud horn formerly used on motor vehicles | Synonyms: claxon |
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| klebsiella | (noun) a genus of nonmotile rod-shaped Gram-negative enterobacteria; some cause respiratory and other infections | - |
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| kleptomania | (noun) an irresistible impulse to steal in the absence of any economic motive | - |
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| kleptomaniac | (noun) someone with an irrational urge to steal in the absence of an economic motive | - |
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| klick | (noun) a metric unit of length equal to 1000 meters (or 0.621371 miles) | Synonyms: kilometer, kilometre, km |
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| klondike | (noun) a form of solitaire that begins with seven piles of cards with the top cards facing up; descending sequences of cards of alternating colors are built on these piles; as aces become available they are placed above the seven piles; the object is to build sequences in suit from ace to king as the remaining cards are dealt out one at a time | - |
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| kludge | (noun) a badly assembled collection of parts hastily assembled to serve some particular purpose | - |
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| klutz | (noun) (Yiddish) a clumsy dolt | - |
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| klystron | (noun) an electron tube used to generate or amplify electromagnetic radiation in the microwave region by velocity modulation | - |
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