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.
1 Helium-used in laser surgery aound the airway to reduce the flammibility of the breathing mixture. 2  Cyclopropane-an obsolete (explosive) anesthetic found on some older medical anesthesia machines. 3  Medical Air-commonly found on modern medical machines to dilute oxygen when other gases are not desired.