Definition that contains chain reaction
- critical at or of a point at which a property or phenomenon suffers an abrupt change especially having enough mass to sustain a chain reaction
- supercritical (especially of fissionable material) able to sustain a chain reaction in such a manner that the rate of reaction increases
- critical mass the minimum mass of fissionable material that can sustain a chain reaction
- uranium 235 a uranium isotope with mass number 235; capable of sustaining chain reactions