The Collaborative International Dictionary of English v.0.48:

Alloy \Al*loy"\, v. t. [imp. & p. p. Alloyed; p. pr. & vb. n.
   Alloying.] [F. aloyer, OF. alier, allier, later allayer,
   fr. L. aligare. See Alloy, n., Ally, v. t., and cf.
   Allay.]
   1. To reduce the purity of by mixing with a less valuable
      substance; as, to alloy gold with silver or copper, or
      silver with copper.
      [1913 Webster]

   2. To mix, as metals, so as to form a compound.
      [1913 Webster]

   3. To abate, impair, or debase by mixture; to allay; as, to
      alloy pleasure with misfortunes.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

blended \blended\ adj.
   1. combined or mixed together so that the constituent parts
      are indistinguishable. Antonym of unblended. [Narrower
      terms: alloyed; emulsified; homogenized]

   Syn: mingled, commingled.
        [WordNet 1.5]

   2. homogeneous heterogeneous
      [WordNet 1.5]

WordNet (r) 3.0 (2006):

alloyed
    adj 1: (used of metals) debased by mixture with an inferior
           element
    2: (used of metals) blended to obtain a desired property