subtopic
noun
sub·top·ic ˈsəb-ˌtä-pik 
variants or sub-topic
plural subtopics or sub-topics
: a topic that is part of a broader or more general topic
… each topic branches off into subtopics. For example, within the Asia area you may find separate discussion threads about Vietnam, Thailand, Malaysia and Bali.
John Eckhouse
John Eckhouse
Word History
First Known Use
1817, in the meaning defined above
Kids Definition
subtopic
noun
sub·top·ic
ˈsəb-ˌtä-pik
: a topic (as in a composition) that is a division of a main topic
- DeMoivre's theorem
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