n.串，丛；vi.丛生，成群

英文释义

n. A number of things of the same kind growing together; a bunch.

n. A number of similar things collected together or lying contiguous; a group; as, a cluster of islands.

n. A number of individuals grouped together or collected in one place; a crowd; a mob.

v. i. To grow in clusters or assemble in groups; to gather or unite in a cluster or clusters.

v. t. To collect into a cluster or clusters; to gather into a bunch or close body.

词干

cluster 丛，簇
→ 词源同clod，clot.即大块形状。