Home/Topics/General Medical Terms/T-3 General Medical Terms Hormones, Diabetes & Metabolism T-3 Listen Save Share Print Meaning of T-3: A thyroid hormone. Definition of T-3 A thyroid hormone. Also called triiodothyronine. Written and maintained by James Murray · Last updated July 21, 2026 Educational reference, not medical advice. Read the limitations. Keep exploringRelated termsMore in General Medical Terms → Diseases & Disorders PCOS Despite the name, the defining problem is hormonal rather than the small follicles that scans pick up, and it reaches well beyond the ovaries. Read definition → Medications & Pharmacology DES A drug whose harms surfaced a generation later, in the children exposed before birth rather than in the women who were treated. Read definition → Medications & Pharmacology duloxetine One drug licensed across mood and pain, duloxetine works partly through spinal cord pathways that damp pain signals before they reach the brain. Read definition → Healthcare Roles & Organizations endocrinologist Hormones travel everywhere, so this specialty is defined by the messenger rather than by a single organ or region of the body. Read definition →
Diseases & Disorders PCOS Despite the name, the defining problem is hormonal rather than the small follicles that scans pick up, and it reaches well beyond the ovaries. Read definition →
Medications & Pharmacology DES A drug whose harms surfaced a generation later, in the children exposed before birth rather than in the women who were treated. Read definition →
Medications & Pharmacology duloxetine One drug licensed across mood and pain, duloxetine works partly through spinal cord pathways that damp pain signals before they reach the brain. Read definition →
Healthcare Roles & Organizations endocrinologist Hormones travel everywhere, so this specialty is defined by the messenger rather than by a single organ or region of the body. Read definition →