A chassis or framework-like structure underneath a railroad car to which wheel axles (and, hence, wheels) are attached through bearings. (Not to be confused with railway truck or railtruck, which are British English synonyms of railroad car)
a refrigerator car (type of boxcar).
A refrigerated, insulated trailer, ship or shipping container.
A marijuana cigarette.
Someone who reefs sails, especially a midshipman.
A reefer jacket; a close-fitting jacket or short coat of thick cloth.
Marijuana.