noun. 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.
- Khmer Rouge
- Party of Democratic Kampuchea
noun. a colorless element that is one of the six inert gasses; occurs in trace amounts in air.
- inert gas
- chemical element
- atomic number 36