With singular agreement. A former order of birds comprising those that scratch the ground to obtain food, including the gallinaceous birds and the doves and pigeons; (with plural agreement) the members of this order.
The order corresponds largely to the modern orders Galliformes, Columbiformes, and Pteroclidiformes.
Early 19th century; earliest use found in James Jennings (d. c1834). From scientific Latin Rasores, specific use of plural of classical Latin rāsor scraper (only recorded in an 8th-cent. epitome) from rās-, past participial stem of rādere to scrape, scratch + -or.