Definition of "sunblocked"

Skin needs ultraviolet radiation to begin the synthesis of vitamin D, but dermatologists say you can probably get the necessary electromagnetic input from a mere 20 minutes of sun exposure a week, as you go about your daily affairs, sunblocked and sans beach.

2007 September 4, Natalie Angier, “A Supple Casing, Prone to Damage”, in New York Times‎