| karabiner | (noun) an oblong metal ring with a spring clip; used in mountaineering to attach a rope to a piton or to connect two ropes | Synonyms: carabiner, snap ring |
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| karakul | (noun) hardy coarse-haired sheep of central Asia; lambs are valued for their soft curly black fur | Synonyms: broadtail, caracul |
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| karaoke | (noun) singing popular songs accompanied by a recording of an orchestra (usually in bars or nightclubs) | - |
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| karat | (noun) the unit of measurement for the proportion of gold in an alloy; 18-karat gold is 75% gold; 24-karat gold is pure gold | Synonyms: carat, kt |
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| karate | (noun) a traditional Japanese system of unarmed combat; sharp blows and kicks are given to pressure-sensitive points on the body of the opponent | - |
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| karma | (noun) (Hinduism and Buddhism) the effects of a person's actions that determine his destiny in his next incarnation | - |
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| karyokinesis | (noun) organic process consisting of the division of the nucleus of a cell during mitosis or meiosis | - |
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| karyolymph | (noun) a clear liquid in the cell nucleus in which the nucleolus and chromatin and other structures are dispersed | - |
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| karyolysis | (noun) disintegration and dissolution of a cell nucleus when a cell dies | - |
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| karyon | (noun) a part of the cell containing DNA and RNA and responsible for growth and reproduction | Synonyms: cell nucleus, nucleus |
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| karyoplasm | (noun) the protoplasm that constitutes the nucleus of a cell | Synonyms: nucleoplasm |
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| karyotype | (noun) the appearance of the chromosomal makeup of a somatic cell in an individual or species (including the number and arrangement and size and structure of the chromosomes) | - |
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