(adjective)
relating to or suffering from a lack of appetite, often in the form of anorexia nervosa, an eating disorder in which people become excessively thin due to a fear of gaining weight;
e.g. They were feeling rather anorectic and had no desire to eat anything. He had a tall, anorectic body on which his clothes hung loosely.
(adjective)
causing a lack or loss of appetite, often describing a substance such as a drug;
e.g. The medicine has anorectic side effects, by which people taking it don't feel very hungry.
(noun)
a substance, especially a drug, that causes a lack or loss of appetite;
e.g. A medicine that is an anorectic can help one lose weight, but should be taken only on a doctor's advice.
(noun)
a person suffering from anorexia, a medical condition in which a fear of gaining weight prevents the person from eating and causes them to become extremely thin;
e.g. Many medical specialists may work together to held an anorectic overcome their condition.