sub assembly

/ˌsʌb.əˈsɛm.bli/
noun
  1. A smaller unit or part that is put together separately and then combined with other parts to make a larger product, especially in manufacturing or construction.
    • The technician tested the electronic sub-assembly to make sure all the wires were connected correctly.
    • Each sub-assembly of the bookshelf was packaged separately for easy assembly at home.
    • The factory produces the engine sub-assembly before attaching it to the car body.
Antonyms