Definition of Ad lib

1. What's Causing Your Pelvic Pain Slideshow
2. Disease Prevention in Women Slideshow Pictures
3. Happiness Quiz: Test Your Emotional Intelligence Quotient (EQ)

Ad lib: Abbreviation for the Latin "ad libitum" meaning "at pleasure" and "at one's pleasure, as much as one desires, to the full extent of one's wishes." Sometimes seen on a prescription or doctor's order. For example, during an overnight fast when the patient is not to eat any food but can have water, the doctor's order might read: "Water ad lib" (water as desired).