Definition of: turf

(tûrf) noun plural turfs (Archaic turves)
1. A mass of matted roots of grass and other fine plants filling the upper stratum of certain soils; a sod.
2. Peat.
3. Loosely, a grass plot.
4. A racecourse; horse–racing: in the phrase the turf.
5. Slang a A home territory, especially that of a youthful street gang, defended against invasion by rival gangs. b Any place regarded possessively as the center of one's activity or interest: Philadelphia is his turf.
—v.t. To cover with turf; sod. [OE]
—turf′y adjective