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

AGGLUTINATE is a 11 letter word that starts with A.

1. \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.
   

2. \Ag*glu"ti*nate\, a.
   1. United with glue or as with glue; cemented together.
   2. (physiol.) Consisting of root words combined but not
      materially altered as to form or meaning; as, agglutinate
      forms, languages, etc. See {Agglutination}, 2.