Definition of Riedel in US English:



  • 1Anatomy. In the genitive, especially in "Riedel's lobe". Designating a tongue-shaped process extending downwards from the inferior margin of the right lobe of the liver, seen as an anatomic variant.

  • 2Medicine. In the genitive. Designating a rare chronic inflammatory disease of the thyroid producing dense fibrosis of the gland, often with extension to adjacent tissues.


Late 19th century; earliest use found in The Lancet. From the name of Bernhard Moritz Karl Ludwig Riedel, German surgeon, who described the lobe of the liver in 1888 and the thyroid disease in 1896.