Relating to or involving the transmission of heat through a material; of or concerning diathermy or heat therapy.
From Greek 'dia-' (through) + 'thermē' (heat) + '-ic' (adjective suffix), developed in medical and physics contexts during the 19th century.
Diathermic equipment in physical therapy clinics works by creating heat deep within muscles and tissues, which is why athletes still use these machines even though modern ultrasound and other techniques are now available.
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