What does photolytic mean?
Photolytic is a technical adjective describing a process that results from photolysis: the breaking down or chemical transformation of a substance when it absorbs light. The term is commonly used with words such as reaction, cleavage, decomposition, and degradation, as in photolytic cleavage. In chemistry, the absorbed light can provide the energy needed to split molecular bonds or initiate reactions; related processes also occur in atmospheric science and biology. Photolytic is more precise than simply light-related because it specifically implies a light-induced chemical breakdown or change. It is not generally used for a substance merely because it absorbs or reflects light. Outside specialist writing, the related noun photolysis is also more readily understood than the adjective. The word comes from Greek roots meaning “light” and “loosening” or “dissolution,” accurately reflecting the way light can break a chemical structure apart.
adjectiveRelating to photolysis, a chemical process in which light causes a substance to break down or undergo a chemical change.
- Of or relating to photolysis or to decomposition or chemical change caused by light.
"The compound undergoes photolytic cleavage when exposed to ultraviolet light."
"Spectroscopy was used to identify the products of the photolytic reaction."
"The film's protective layer was weakened by photolytic degradation."
Photolytic processes put light to work as a molecular forceps, breaking chemical bonds apart.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does photolytic come from?
The adjective was formed in English from photo-, associated with Greek phōs, “light,” and the combining form -lytic, derived from Greek lūsis, “loosening” or “dissolution.” The underlying noun photolysis was also formed through the same Greek elements. Its relatives lysis and lytic belong to the same etymological family, as does hydrolysis, although hydrolysis specifically involves the splitting of a compound by water rather than light.
Related word forms
How photolytic is actually used
Chiefly used in technical contexts, especially chemistry, biochemistry, and environmental science. It usually describes a reaction, process, cleavage, or decomposition brought about by light rather than a person or device.