Definition of "precast"

The new culvert, 200 ft. long, was constructed with precast reinforced concrete segments, similar to those used in building the London tube railway tunnels, and is being lined internally with reinforced concrete placed in situ to give a finished internal diameter of 9 ft.

1950 October, “Completion of Flood-Damage Repairs, East Coast Main Line”, in Railway Magazine, page 709

Except that in their case, the logs are made from precast concrete shaped and painted to look like the real thing.

2009 January 22, Jim Robbins, “The Logless Log Home”, in New York Times‎

Each TBM installs two-metre-wide rings made up of seven precast concrete segments produced on-site. Each ring takes approximately 45 minutes to one hour to install.

2021 July 14, Paul Stephen, “A portal into the future”, in RAIL, number 935, page 52. photo caption