Definition
It appears there may be a typo in the input. The correct term is likely "target organ." If that is the case, a target organ is a specific organ or tissue that is affected by a particular hormone, drug, or disease. It's the place where a substance exerts its primary effect. Think of it like a specific lock that a particular key (hormone or drug) fits into. For example, the thyroid gland is a target organ for thyroid-stimulating hormone (TSH). Understanding target organs is crucial in medicine and pharmacology.