It seems there might be a little confusion here. "Otto Robert Frisch" is not a common English word but rather a proper noun, specifically the name of a notable person. Let me explain who he is in simple terms.
Definition: Otto Robert Frisch was a British physicist born in Austria who made important contributions to the field of nuclear physics. He worked with another scientist, Lise Meitner, to understand and explain a new type of nuclear reaction called nuclear fission. This reaction is when an atomic nucleus splits into smaller parts, which can release a great amount of energy. Frisch also explained how this process could lead to a powerful explosion.
Otto Robert Frisch was an important physicist who helped discover and explain nuclear fission. His work is foundational in the field of nuclear energy.