Epidural: Outside the dura, the outermost, toughest, and most fibrous of the three membranes (meninges) covering the brain and the spinal cord. An epidural hematoma is a collection of blood beneath the skull but outside the dura. QUESTION The first sign of pregnancy is most often: See Answer From Pregnancy and Parenting Resources Ovulation CalculatorPregnancy Week by Week12 Natural Cold & Flu Remedies Featured Centers Good and Bad Foods for PsoriasisVideo: Getting Personal on Life With MS Health Solutions From Our Sponsors Shot-Free MS Treatment Your Child and COVID-19