What is "benzophenone"

n. 1 (context organic chemistry countable English) Any of a class of aromatic ketones based on the parent compound diphenylketone (C₆H₅)₂CO; used, amongst other things, as ingredients in sunblock. 2 (context organic compound uncountable English) The compound diphenylmethanone.

Benzophenone is the organic compound with the formula ( C H)C O, generally abbreviated PhCO. Benzophenone is a widely used building block in organic chemistry, being the parent diarylketone.