photoreversible
/ˌfəʊtəʊrɪˈvəːsɪbl/Chiefly Biology
adjective
Of a biochemical change: capable of being reversed by the action of light. Of a molecule: existing in different forms according to the wavelength of incident light; photoconvertible.
Origin
1940s; earliest use found in American Journal of Botany. From photo- + reversible.