• (a.) Interlaced; linked together; -- said of charges or bearings. See Fretted.
In`ter·fret'ted adjective (Her.) Interlaced; linked together; -- said of charges or bearings. See Fretted . 
In heraldry, interfretted means interlaced. The term is applied to any bearings linked together, one within the other, as keys interlaced in the bows, or one linked into the other.