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Peroxyl radical

Radical that contains a peroxyl (-O-O-) group.

Also: ROO•

Lipid peroxyl radicals propagate chain oxidation of polyunsaturated fatty acids. Quenched by chain-breaking antioxidants such as α-tocopherol.

How one textbook covers it

Advanced Nutrition and Human Metabolism, 8th ed. (Gropper) — Glossary
Lipid peroxyl radicals propagate chain oxidation of polyunsaturated fatty acids. Quenched by chain-breaking antioxidants such as α-tocopherol.

Alkoxyl radical, Free radical