*auger*

n. [ OE. augoure, nauger, AS. nafegār, fr. nafu, nafa, nave of a wheel + gār spear, and therefore meaning properly and originally a nave-bore. See Nave (of a wheel) and 2d Gore, n. ] 1. 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. [ 1913 Webster ]

2. 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. [ 1913 Webster ]

Auger bit, a bit with a cutting edge or blade like that of an anger. [ 1913 Webster ]