adjective, sourer, sourest. 1. having an acid taste, resembling that of vinegar, lemon juice, etc.; tart. 2. rendered acid or affected by fermentation; fermented. 3. producing the one of the four basic taste sensations that is not bitter, salt, or sweet. 4. characteristic of something fermented: a sour smell.
General anesthetics normally are used to produce loss of consciousness before and during surgery. However, for obstetrics (labor and delivery) or certain minor procedures, an anesthetic may be given in small amounts to relieve anxiety or pain without causing unconsciousness.
Spinal blocks, epidural blocks and peripheral nerve blocks -- which can numb a leg, arm or the head -- are all types of regional anesthesia. Regional anesthesia can be used alone during surgery, in combination with general anesthesia during surgery or after surgery for pain control. The American Society of Regional Anesthesia and Pain Medicine has information on regional anesthesia. For general anesthesia, the provider typically will administer the anesthetic as a gas through a mask and/or intravenously. The anesthetic makes the patient unconscious and unable to feel pain.