subgroup

(-gro̵̅o̅p′)

noun

  1. a subdivision of a group; subordinate group
  2. Chem. a vertical subdivision of a group in the periodic table of chemical elements
  3. Math. a group whose elements form a subset of another group

See subgroup in American Heritage Dictionary 4

noun
  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.
transitive verb sub·grouped, sub·group·ing, sub·groups
To divide into subgroups.

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