ag·glom·er·ate 
(ə-glŏmə-rāt′)
(ə-glŏmə-rāt′)tr. & intr.v. ag·glom·er·at·ed, ag·glom·er·at·ing, ag·glom·er·ates
To form or collect into a rounded mass.
adj. (-ər-ĭt)
Gathered into a rounded mass.
n. (-ər-ĭt)
1. A confused or jumbled mass; a heap.
2. A volcanic rock consisting of rounded and angular fragments fused together.
[Latin agglomerāre, agglomerāt-, to mass together : ad-, ad- + glomerāre, to form into a ball (from glomus, glomer-, ball).]
ag·glomer·a′tive (-ə-rā′tĭv, -ər-ə-tĭv) adj.
ag·glomer·a′tor n.