Home›Browse›A›anorexia nervosaanorexia nervosaOur editors are putting together more complete content — check back in about 20 minutesanorexia nervosaanorexia nervosa — nounnoun1. an eating disorder causing extreme weight loss and fear of gaining weight1.nounDefinitionan eating disorder causing extreme weight loss and fear of gaining weightExampleShe was diagnosed with anorexia nervosa and started treatment.