An Etymological Dictionary of Astronomy and Astrophysics

1. Anything composed of heterogeneous materials or elements.
   

2. Geology: A sedimentary rock made of rounded rock fragments (greater than two millimeters in diameter), such as pebbles, cobbles, and boulders, in a finer-grained matrix.

Etymology (EN): From L. conglomeratus, p.p. of conglomerare “to roll together,” from → com- “together” + glomerare “to gather into a ball,” from glomus (genitive glomeris) “a ball,” globus “globe;” PIE *gel- “to make into a ball.”

Etymology (PE): Hâgolemidan, from hâ- “together,” → com-, + golem “glomus,” → agglomerate.