The Collaborative International Dictionary of English v.0.48:

Agglutinate \Ag*glu"ti*nate\, v. t. [imp. & p. p.
   Agglutinated; p. pr. & vb. n. Agglutinating.] [L.
   agglutinatus, p. p. of agglutinare to glue or cement to a
   thing; ad + glutinare to glue; gluten glue. See Glue.]
   To unite, or cause to adhere, as with glue or other viscous
   substance; to unite by causing an adhesion of substances.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Agglutinate \Ag*glu"ti*nate\, a.
   1. United with glue or as with glue; cemented together.
      [1913 Webster]

   2. (Physiol.) Consisting of root words combined but not
      materially altered as to form or meaning; as, agglutinate
      forms, languages, etc. See Agglutination, 2.
      [1913 Webster]

WordNet (r) 3.0 (2006):

agglutinate
    adj 1: united as if by glue [syn: agglutinate,
           agglutinative]
    v 1: string together (morphemes in an agglutinating language)
    2: clump together; as of bacteria, red blood cells, etc.