Relating to or being a structural member, especially of concrete, that has been cast into form before being transported to its site of installation. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "precast" in a sentence
"Construction will be much easier if the lintels are "precast": that is, made in advance and then placed in the wall like a brick."
"Therefore viaduct spans have been constructed using various construction methods depending on the nature of the site, such as precast segment method using gantry cranes, and the balanced cantilever method."
"The outside rings are made of precast concrete, similar to those usually seen in culverts. - via [...]"