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Khmer Rouge, KR, Party of Democratic Kampuchea, Communist Party of Kampuchea | [in terrorism] a communist organization formed in Cambodia in 1970; became a terrorist organization in 1975 when it captured Phnom Penh and created a government that killed an estimated three million people; was defeated by Vietnamese troops but remained active until 1999 | ||
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krypton, Kr, atomic number 36 | a colorless element that is one of the six inert gasses; occurs in trace amounts in air |