Hypertext Webster Gateway: "subgroup"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Subgroup \Sub"group`\, n. (Biol.)
A subdivision of a group, as of animals. --Darwin.
From WordNet (r) 1.7 (wn)
subgroup
n 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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