Special | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | ALL

---

SAD Seasonal affective disorder (SAD) is episodes of depression that occur at a certain time of the year, usually during winter.  The disorder may begin during the teen years or in early adulthood. Like other forms of depression, it occurs more often in women than in men.

Seasonal affective disorder Seasonal affective disorder (SAD) is episodes of depression that occur at a certain time of the year, usually during winter.  The disorder may begin during the teen years or in early adulthood. Like other forms of depression, it occurs more often in women than in men.

SPF The sun protection factor of a sunscreen is a laboratory measure of the effectiveness of sunscreen — the higher the SPF, the more protection a sunscreen offers against UV-B