a carpenter's tool for boring holes larger than those bored by a gimlet. it has a handle placed crosswise by which it is turned with both hands. a pod auger is one with a straight channel or groove, like the half of a bean pod. a screw auger has a twisted blade, by the spiral groove of which the chips are discharge.-an instrument for boring or perforating soils or rocks, for determining the quality of soils, or the nature of the rocks or strata upon which they lie, and for obtaining water.