A tripeptide hormone from the hypothalamus, which stimulates the anterior lobe of the hypophysis to release thyrotropin; l-pyroglutamyl-l-histidyl-l-prolinamide. SYN: thyroid-stimulating hormone-releasing factor, thyrotropin-releasing hormone. [thyrotropin + L. libero, to free, + -in]
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thy·ro·lib·er·in (thi″ro-libґər-in) [thyrotropin + -liberin] thyrotropin-releasing hormone.Medical dictionary. 2011.