say it: PREE-fab
prefab is a noun and adjective meaning "a prefabricated structure". It carries 2 recorded senses.
a prefabricated structure
manufactured in standard sizes to be shipped and assembled elsewhere
“a prefab structure”
Forms marked are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for prefab come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.