WordReference Random House Learner's Dictionary of American English © 2017
pre•fab /adj., n. ˈpriˌfæb; v. priˈfæb/USA pronunciation   adj., n., v.,  -fabbed, -fab•bing. 

adj. [before a noun]
  1. Buildingprefabricated.

n. [countable]
  1. Buildingsomething prefabricated, as a building.

v. [+ object]
  1. Buildingto prefabricate.

WordReference Random House Unabridged Dictionary of American English © 2017
pre•fab  (adj., n. prēfab′;v. prē fab),USA pronunciation adj., n., v.,  -fabbed, -fab•bing. 
  1. Buildingprefabricated.

  1. Buildingsomething that is prefabricated, as a building or fixture:You would never know that such an attractive house is a prefab.

  1. Buildingto prefabricate.
  • by shortening 1935–40

Collins Concise English Dictionary © HarperCollins Publishers::

prefab /ˈpriːˌfæb/ n
  1. a building that is prefabricated, esp a small house

'prefab' also found in these entries:

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