• A lack or loss of appetite for food (as a medical condition).
  Human Phenotype Ontology (HPO)
  The Human Phenotype Ontology Project, 2021
• An abnormal loss of the appetite for food. Anorexia can be caused by cancer, AIDS, a mental disorder (i.e., anorexia nervosa), or other diseases.
  NCI Dictionary of Cancer Terms
  U.S. National Cancer Institute, 2021
• An eating disorder in which a person has an intense fear of gaining weight and severely limits calories to the point of near starvation.
  Harvard Dictionary of Health Terms
  Harvard Medical Publishing, 2011
• Clinical manifestation consisting of a physiopathological lack or loss of appetite accompanied by an aversion to food and the inability to eat.
  CRISP Thesaurus
  National Institutes of Health, 2006
• Loss of, or decrease in appetite. In anorexia nervosa appetite may be preserved but the patient refuses to eat.
  Sadock's Comprehensive Glossary of Psychiatry and Psychology
  BJ Sadock Titles Press, 2012
• The lack or loss of APPETITE accompanied by an aversion to food and the inability to eat. It is the defining characteristic of the disorder ANOREXIA NERVOSA.
  NLM Medical Subject Headings
  U.S. National Library of Medicine, 2021
• A disorder characterized by a loss of appetite.
  Common Terminology Criteria for Adverse Events
  U.S. National Institutes of Health, 2021
• Anorexia, persistent lack of appetite not caused by repletion. It may spring from psychoneurotic causes, as in anorexia nervosa, a lack of appetite, primarily in young women, that may lead to extreme emaciation and even to death. Anorexia, like nausea and vomiting, may be brought about by...
  Encyclopedia Britannica
  Encyclopedia Britannica, Inc., 2020