subgroup

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subgroup

(sŭb′gro͞op′)
n.
1. A distinct group within a group; a subdivision of a group.
2. A subordinate group.
3. Mathematics A group that is a subset of a group.
tr.v. sub·grouped, sub·grouping, sub·groups
To divide into subgroups.

subgroup

(sŭb′groop″)
In a research study a selected population of patients who share one or more common traits and thus can be distinguished from the rest of the individuals investigated.