1. photofission - Noun
2. photofission - Verb
photofission (usually uncountable, plural photofissions)
(nuclear physics) Nuclear fission as the result of the absorption of a gamma ray or other high-energy photon.
photofission (third-person singular simple present photofissions, present participle photofissioning, simple past and past participle photofissioned)
(nuclear physics) To undergo, or cause to undergo, photofission.