Subdural is a medical term used to describe a location below the dura mater, which is a tough membrane that covers the brain and spinal cord. Some synonyms for subdural include infratentorial, infracalvarial, and infracranial. Infratentorial refers to a location beneath the cerebellum, which is part of the brain located below the tentorium cerebelli. Infracalvarial is a term used to describe a location beneath the skull. Infracranial also describes a location below the skull but encompasses both the brain and the skull. These synonyms are commonly used in medical settings to describe specific locations within the body and can help doctors and healthcare professionals accurately communicate and diagnose medical conditions.