1. Plural of idiopathy; diseases or conditions that arise spontaneously or from an unknown cause, without a preceding disease or external cause.
Usage: Medical/clinical term; Formal register

Examples

• The patient was diagnosed with one of several idiopathies that affect the nervous system.
• Many idiopathies remain poorly understood despite decades of medical research.
• Doctors struggled to identify the cause, suspecting it was one of the rare idiopathies.
• Treatment options for idiopathies are often limited when the underlying cause is unknown.
• The study examined how different idiopathies respond to experimental therapies.