component part
- A constituent piece of a larger entity that, if separated, would cause substantial harm to itself or to the greater immovable structure to which it's attached
- The engineer declared that the pillar was a component part of the structure, and removing it could cause the building to collapse.
- The antique chandelier, fixed firmly to the ceiling, was considered a component part of the historic mansion.
- During the renovation, careful consideration was needed to avoid damaging a component part of the house, as it could lead to structural instability.
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