Medical Definition of avobenzone
: a chemical compound C20H22O3 that absorbs UVA radiation and is used as an ingredient in sunscreens <Avobenzone is the most widely used ingredient to absorb UVA, the type of ultraviolet light that contributes to skin cancer and aging of the skin, but it degrades in sunlight, so it has to be combined with other ingredients to be effective.—Susan Carpenter, The Los Angeles Times, 27 June 2010> <Look for sunblocks and you shouldn't have any problem finding avobenzone (aka Parsol 1789), titanium dioxide, or zinc oxide.—Harvard Health Letter September 2001> ◆Avobenzone is marketed under the trademark Parsol.
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