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Layer
From Biology-Online Dictionary
1. One who, or that which, lays.
2. [Prob. A corruption of lair] That which is laid; a stratum; a bed; one thickness, course, or fold laid over another; as, a layer of clay or of sand in the earth; a layer of bricks, or of plaster; the layers of an onion.
3. A shoot or twig of a plant, not detached from the stock, laid under ground for growth or propagation.
4. An artificial oyster bed.
