n. A projecting part of a building, especially a part that projects so as to overhang the wall below, as the upper story of a timber house, a bay-window, etc. See extract under jetty, intransitive verbn. A projection of stone, brick, wood, or other material (but generally formed of piles), affording a convenient place for landing from and discharging vessels or boats, or serving as a protection against the encroachment or assault of the waves; also, a pier of stone or other material projecting from the bank of a stream obliquely to its course, for the purpose of directing the current upon an obstruction to be removed, as a bed of sand or gravel, or to deflect it from a bank which it tends to undermine.To jut; project.To make a jetty.Jetting, or jutting out; swelling.Made of jet.Black as jet.