Dictionary.net

• a large wagon with broad wheels and an arched canvas top; used by the United States pioneers to cross the prairies in the 19th century

2006 - WordNet 3.0
By Princeton University

• a large wagon with broad wheels and an arched canvas top; used by the United States pioneers to cross the prairies in the 19th century

2011 - English Dictionary Database
By DataStellar Co., Ltd