WordReference Random House Unabridged Dictionary of American English © 2026
sub•group
(sub′gro̅o̅p′),USA pronunciation n.
- a subordinate group;
a division of a group. - Chemistrya division of a group in the periodic table.
- Mathematicsa subset of a group that is closed under the group operation and in which every element has an inverse in the subset.
- sub- + group 1835–45
'subgroup' also found in these entries (note: many are not synonyms or translations):
Breton
- alternating group
- Apachean
- cerium metal
- commutator group
- coset
- Eastern Algonquian
- group
- Indic
- Lagrange's theorem
- normal
- normal divisor
- normalizer
- normal series
- Oto-Manguean
- quotient group
- rhenium
- Tanoan
- terbium metal
- Wakashan
- yttrium metal
- simple group
- subring