The phenomenon whereby exposure of living material to visible light can counteract damage to genetic material caused by previous ultraviolet irradiation; an instance of this.
Origin
1940s. From photo- + reactivation.
Definition of photoreactivation in US English:
photoreactivation
nounˌfəʊtəʊrɪˌaktɪˈveɪʃn
Biology
The phenomenon whereby exposure of living material to visible light can counteract damage to genetic material caused by previous ultraviolet irradiation; an instance of this.