n. In building, one of the beams which give the slope of a roof, and to which is secured the lath or other framework upon which the slate or other outer covering is nailed.n. Same as carline, 2.n. In anatomy, a trabecule or trabeculum: as, the rafters of the embryonic skull.To form into or like rafters: as, to rafter timber.To furnish or build with rafters: as, to rafter a house.In agriculture, to plow, as a piece of land, by turning the grass side of the plowed furrow on a strip of ground left unplowed.n. One who is employed in rafting timber, or transporting it in rafts, as from a ship to the shore.