An Etymological Dictionary of Astronomy and Astrophysics

1. (v.) To collect or gather into a cluster or mass.
   

2. (adj.) Gathered together into a cluster or mass.
   

3a) (n.) A mass of things clustered together.

3b) A rock composed of rounded or angular volcanic fragments (Dictionary.com).

Etymology (EN): From L. agglomeratus, p.p. of agglomerare “to wind or add onto a ball,” from → ad- “to” + glomerare to “wind up in a ball,” from glomus (genitive glomeris) “ball of yarn,” globus “globe;” PIE *gel- “to make into a ball.”

Etymology (PE): Bargolemidan, from suffix bar- “to, on, upon,” + golem, from Lori, Laki golemâ, golama “curd, obtained from milk by coagulation, used to make cheese,” Lori golem “stagnating water,” Sangesari, Semnâni, Sorxe-yi, Lâsgardi golma, “boll, i.e.
the rounded seed capsule of plants such as cotton,” + -idan infinitive suffix.