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WordNet (r) 3.0 (2006) (WordNet)

Kr
n 1: a colorless element that is one of the six inert gasses;
occurs in trace amounts in air [synonym: {krypton}, {Kr},
{atomic number 36}]
2: 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 [synonym: {Khmer Rouge}, {KR}, {Party
of Democratic Kampuchea}, {Communist Party of Kampuchea}]