1. shaped, molded, or made in advance before final use or assembly

Examples

• The construction crew installed preformed concrete panels.
• She bought preformed hamburger patties to save time.
• The dentist used a preformed crown for the tooth repair.
• Preformed plastic containers are cheaper than custom molds.
• The kit included preformed metal brackets for easy assembly.
• Preformed fiberglass pools are popular for quick installation.