Definitions
1.nounA shelf on which articles may be laid; also, that which resembles such a shelf in form or use, as a projecting ridge or part, or a molding or edge in joinery.
2.nounA shelf, ridge, or reef, of rocks.
3.nounA layer or stratum.
4.nounA lode; a limited mass of rock bearing valuable mineral.
5.nounA (door or window) lintel.
6.nounA cornice.
7.nounA piece of timber to support the deck, placed athwartship between beams.
8.verbTo cause to have, or to develop, a ledge (during mining, canal construction, building, etc).