agglomerate

American Heritage® Dictionary of the English Language, Fourth Edition

1. v. To form or collect into a rounded mass.
2. adj. Gathered into a rounded mass.
3. n. A confused or jumbled mass; a heap.
4. n. A volcanic rock consisting of rounded and angular fragments fused together.

Century Dictionary and Cyclopedia

1. To collect or gather into a mass.
2. To gather, grow, or collect into a ball or mass: as, “hard, agglomerating salts,”
3. Gathered into a ball or mass; piled together; specifically, in botany, crowded into a dense cluster, but not cohering.
4. n. A fortuitous mass or assemblage of things; an agglomeration.
5. n. In geology, an accumulation of materials made up chiefly of large blocks “huddled together in a pell-mell way, without regard to size, shape, or weight.” The term is used almost exclusively with reference to volcanic ejections, and is rarely, if ever, employed by American authors. See breccia and conglomerate.

Wiktionary

1. adj. Collected into a ball, heap, or mass.
2. n. A collection or mass.
3. n. geology A mass of angular volcanic fragments united by heat; distinguished from conglomerate.
4. n. meteorology An ice cover of floe formed by the freezing together of various forms of ice.
5. v. To wind or collect into a ball; hence, to gather into a mass or anything like a mass.

GNU Webster's 1913

1. v. To wind or collect into a ball; hence, to gather into a mass or anything like a mass.
2. v. To collect in a mass.
3. adj. Collected into a ball, heap, or mass.
4. adj. (Bot.) Collected into a rounded head of flowers.
5. n. A collection or mass.
6. n. (Geol.) A mass of angular volcanic fragments united by heat; -- distinguished from conglomerate.

WordNet 3.0

1. adj. clustered together but not coherent
2. n. volcanic rock consisting of large fragments fused together
3. n. a collection of objects laid on top of each other
4. v. form into one cluster