soldier: a wingless sterile ant or termite having a large head and powerful jaws adapted for defending the colony
worker: sterile member of a colony of social insects that forages for food and cares for the larvae
epidural anesthesia: regional anesthesia resulting from injection of an anesthetic into the epidural space of the spinal cord; sensation is lost in the abdominal and genital and pelvic areas; used in childbirth and gynecological surgery