What is "caprolactone"

n. (context organic compound usually uncountable English) A cyclic ester with the chemical formula C₆H₁₀O₂

ε-Caprolactone or simply caprolactone is a cyclic ester, a member of the lactone family, with a seven-membered ring with the formula (CH)CO. This colorless liquid is miscible with most organic solvents. It is produced on a large scale as a precursor to polycaprolactones.