1. kr(n = noun.substance) atomic number 36, krypton - a colorless element that is one of the six inert gasses; occurs in trace amounts in air;
is a kind of chemical element, element, argonon, inert gas, noble gas
2. kr(n = noun.group) communist party of kampuchea, khmer rouge, party of democratic 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;
is a kind of foreign terrorist organization, fto, terrorist group, terrorist organization
The chemical symbol for the element
kr, symb. Chem. the element krypton.