Müller cell
noun
Mül·ler cell
variants:
or Muller cell \ ˈmyül-ər-, ˈmil-, ˈməl- 
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Medical Definition of Müller cell
: any of the glial fibers that extend through the entire thickness of the retina and act as a support for the other structures
— called also fiber of Müller, sustentacular fiber of Müller