The Collaborative International Dictionary of English v.0.48:

Mullerian \M["u]l*le"ri*an\, prop. a. (Anat., Med.)
   Of, pertaining to, or discovered by, Johannes M["u]ller; as,
   Mullerian duct; Muellerian tumor; M["u]llerian capsule.
   [1913 Webster + PJC]

   M["u]llerian ducts (Anat.), a pair of embryonic ducts which
      give rise to the genital passages in the female, but
      disappear in the male.

   M["u]llerian fibers (Anat.), the sustentacular or
      connective-tissue fibers which form the framework of the
      retina.
      [1913 Webster]