1. (noun) krypton, Kr, atomic number 36
a colorless element that is one of the six inert gasses; occurs in trace amounts in air
Synonyms: atomic number 36, krypton
2. (noun) Khmer Rouge, KR, Party of Democratic Kampuchea, Communist Party of Kampuchea
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
Synonyms: atomic number 36, krypton
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Synonyms for KR 
