An isotope of uranium, mass number 235, which is able to sustain a nuclear chain reaction, making it suitable for use in nuclear power and nuclear weapons.
Origin
1930s; earliest use found in Science News.
Definition of uranium-235 in US English:
uranium-235
noun
An isotope of uranium, mass number 235, which is able to sustain a nuclear chain reaction, making it suitable for use in nuclear power and nuclear weapons.