AstroTurf Syllabification: (As·tro·Turf)Pronunciation: /ˈastrōˌtərf/Definition of AstroTurf noun trademark an artificial grass surface, used for athletic fields. Origin: 1960s: from astrodome (sense 1), where it was first used, + turfAstroTurf in other Oxford dictionaries Definition of AstroTurf in the British & World English dictionary