The Collaborative International Dictionary of English v.0.48:

Agglomerative \Ag*glom"er*a*tive\, a.
   Having a tendency to gather together, or to make collections.
   [1913 Webster]

         Taylor is eminently discursive, accumulative, and (to
         use one of his own words) agglomerative. --Coleridge.
   [1913 Webster]

WordNet (r) 3.0 (2006):

agglomerative
    adj 1: clustered together but not coherent; "an agglomerated
           flower head" [syn: agglomerate, agglomerated,
           agglomerative, clustered]