subgroup

Noun

WordNet 3.0

Noun (2)

  1. a distinct and often subordinate group within a group
  2. (mathematics) a subset (that is not empty) of a mathematical group
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Webster's Dictionary (GCIDE)

Subgroup \Sub"group`\, n. (Biol.) A subdivision of a group, as of animals. --Darwin. [1913 Webster]
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