If a company belongs to another company, then the owned company is a subsidiary. When a large company bought your small business, you became a subsidiary. It still hurts to call them the parent company, since you publish novels and they make toilet paper.

The adjective form of subsidiary describes something that is of secondary importance or that functions in a supporting capacity. In addition to running the band program, you're a member of several subsidiary committees like the fund raising committee and the hospitality committee. Traffic on the road was light when you drove outside the city, but as more subsidiary roads joined with the main one, traffic quickly became congested.

Definitions of subsidiary
  1. adjective
    functioning in a supporting capacity
    synonyms: auxiliary, supplemental, supplementary
    being of second rank or importance or value; not direct or immediate
  2. noun
    an assistant subject to the authority or control of another
    synonyms: foot soldier, subordinate, underling
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    a person with subordinate membership in a society, institution, or commercial enterprise
    bottom dog
    a person of low status
    a subordinate who performs an important but routine function
    a male subordinate
    second banana, second fiddle
    someone who serves in a subordinate capacity or plays a secondary role
    type of:
    assistant, help, helper, supporter
    a person who contributes to the fulfillment of a need or furtherance of an effort or purpose
  3. noun
    a company that is completely controlled by another company
    synonyms: subsidiary company
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    type of:
    an institution created to conduct business
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