Source : Webster's Revised Unabridged Dictionary (1913)

Admix \Ad*mix"\, v. t. [Pref. ad- + mix: cf. L. admixtus, p. p.
   of admiscere. See {Mix}.]
   To mingle with something else; to mix. [R.]

Source : WordNet®

admix
     v : mix or blend; "Hyaline casts were admixed with neutrophils"